List of lichens of Maryland


The following list of lichens of Maryland is derived from the following sources:
  • lichens listed in the 1977 publication by Skorepa, Norden, and Windler.
  • lichens listed in the 1979 publication by Skorepa, Norden, and Windler.
  • lichens listed in the 2002 publication by Biechele as occurring on Maryland's Delmarva Peninsula.
  • lichens in Elmer Worthley's personal herbarium.
  • lichens found in Maryland by Edward Uebel.
  • lichens reported on Maryland's Delmarva Peninsula by Lendemer and Knapp at six locations: 1. Millington State Wildlife Management Area ; 2. Idylwild State Wildlife Management Area ; 3. Chesapeake State Forest ; 4. Sharptown Dunes ; 5. Hickory Point Cypress Swamp ; 6. Pocomoke State Forest.

List

  1. Acarospora fuscata Arnold
  2. #Skorepa et al. – on acidic rock.
  3. #E.G. Worthley Herbarium - Carroll Co., on stone wall.
  4. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  5. Acarospora schleicheri A. Massal.
  6. #Skorepa et al. – Lichens of Soldiers Delight.
  7. #Skorepa et al. – on acidic rock.
  8. Ahtiana aurescens Thell & Randlane
  9. #Syn.: Cetraria aurescens Tuck.
  10. #Skorepa et al. – Allegany Co., on branches of pines.
  11. #Skorepa et al. – on bark.
  12. Allocetraria oakesiana Randlane & Thell
  13. #Syn.: Cetraria oakesiana Tuck.
  14. #Skorepa et al. – Frederick Co., base of oak.
  15. #Skorepa et al. – on bark, acidic rock.
  16. #E.G. Worthley Herbarium - Garrett Co., along Big Run, on stumps.
  17. Amandinea milliaria P. May & Sheard
  18. #Syn.: Rinodina milliaria Tuck.
  19. #Skorepa et al. – Calvert Co., on trunks of deciduous trees.
  20. #Skorepa et al. – on bark.
  21. #Biechele – lower eastern shore of Maryland.
  22. Amandinea polyspora E. Lay & P. May
  23. #Syn.: Buellia polyspora Vainio
  24. #Skorepa et al. – Carroll Co., bark of deciduous tree.
  25. #Skorepa et al. – on bark.
  26. #E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
  27. Amandinea punctata Coppins & Scheid.
  28. #Syn.: Buellia punctata Massal.
  29. #Skorepa et al. – Worcester Co., on oak twigs.
  30. #Skorepa et al. – on bark.
  31. #Lendemer & Knapp -
  32. Anaptychia palmulata Vainio
  33. #Skorepa et al. – Calvert Co., trunks of deciduous trees.
  34. #Skorepa et al. – on bark.
  35. #Biechele – lower eastern shore of Maryland.
  36. #E.G. Worthley Herbarium - Baltimore Co.; Calvert Co.; Frederick Co.
  37. Anisomeridium polypori M.E. Barr
  38. #Lendemer & Knapp -
  39. Anzia americana Yoshim. & Sharp
  40. #Lendemer & Knapp -
  41. Anzia colpodes Stizenb.
  42. #Skorepa et al. – on bark.
  43. #Lendemer & Knapp -
  44. Arctoparmelia centrifuga? Hale
  45. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
  46. Arthonia caesia Körber
  47. #Skorepa et al. – Baltimore Co., trunk of oak.
  48. #Skorepa et al. – on bark.
  49. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark; Ridge Road, on bark.
  50. #Lendemer & Knapp
  51. Arthonia rubella Nyl.
  52. #Lendemer & Knapp -,
  53. Arthopyrenia cinereopruinosa A. Massal.
  54. #Syn.: Arthopyrenia pinicola Mass.
  55. #Skorepa et al. – Montgomery Co., trunk of elm.
  56. #Skorepa et al. – on bark.
  57. Arthothelium interveniens Zahlbr.
  58. #Lendemer & Knapp -
  59. Aspicilia caesiocinerea Arnold
  60. #Syn.: Lecanora caesiocinerea Nyl.
  61. #Skorepa et al. – Allegany Co., on shale outcrop.
  62. #Skorepa et al. – on acidic rock.
  63. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Montgomery Co., Great Falls.
  64. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on acidic rock.
  65. Aspicilia cinerea Körber
  66. #Syn.: Lecanora cinerea Somm.
  67. #Skorepa et al. – Baltimore Co., on rock ledges.
  68. #Skorepa et al. – on acidic rock.
  69. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
  70. Bacidia laurocerasi Zahlbr. subsp. laurocerasi
  71. #Syn.: Bacidia atrogrisea Körber
  72. #Skorepa et al. – on bark.
  73. Bacidia polychroa Körber
  74. #Syn.: Bacidia fuscorubella Bausch.
  75. #Skorepa et al. – Baltimore Co., on trunks of deciduous trees.
  76. #Skorepa et al. – on bark.
  77. Bacidia schweinitzii A. Schneider
  78. #Skorepa et al.. – Montgomery Co., on oak.
  79. #Skorepa et al. – on bark.
  80. #Biechele – lower eastern shore of Maryland.
  81. #E.G. Worthley Herbarium – Lichens of Soldiers Delight; Anne Arundel Co., Baltimore Co., Wicomico Co.
  82. #Lendemer & Knapp -,,,
  83. Bacidia trachona Lettau
  84. #Skorepa et al. – on calcareous rock.
  85. Bacidina egenula Vězda
  86. #Lendemer & Knapp -
  87. Bacidina inundata Vezda
  88. #Skorepa et al. – on bark.
  89. Baculifera curtisii Marbach
  90. #Syn.: Buellia curtisii Imsh.
  91. #Skorepa et al.. – Calvert Co., trunk of deciduous tree.
  92. #Skorepa et al. – on bark.
  93. Bathelium carolinianum R.C. Harris
  94. #Lendemer & Knapp -
  95. Biatora vernalis Fr.
  96. #Syn.: Lecidea vernalis Ach.
  97. #Skorepa et al. – Frederick Co., on trunks of oaks.
  98. #Skorepa et al. – on bark.
  99. Brigantiaea leucoxantha R. Sant. & Haffel.
  100. #Biechele – lower eastern shore of Maryland.
  101. #Lendemer & Knapp -,
  102. Bryoria furcellata Brodo & D. Hawksw.
  103. #Syn.: Alectoria nidulifera Norrl.
  104. #Skorepa et al. – Garrett Co., on pine trunks.
  105. #Skorepa et al. – on bark, acid rock.
  106. #E.G. Worthley Herbarium - Wicomico Co.
  107. Buellia badia Massal.
  108. #Syn.: Buellia turgescens Tuck.
  109. #E.G. Worthley Herbarium - Baltimore Co., St. Thomas Cemetery.
  110. Buellia curtisii Imshaug
  111. #Lendemer & Knapp,
  112. Buellia spuria Anzi
  113. #Skorepa et al. – Montgomery Co.
  114. #Skorepa et al. – on acidic rock.
  115. #E.G. Worthley Herbarium – Lichens of Soldiers Delight.
  116. Buellia stigmaea Tuck.
  117. #Skorepa et al. – Baltimore Co.,
  118. #Skorepa et al. – on acidic rock.
  119. Buellia stillingiana J. Steiner
  120. #Skorepa et al. – Calvert Co., on trunks of deciduous trees.
  121. #Skorepa et al. – on bark.
  122. #Biechele – lower eastern shore of Maryland.
  123. #E.G. Worthley Herbarium - Worcester Co.
  124. #Lendemer & Knapp -
  125. Buellia vernicoma Tuck.
  126. #Lendemer & Knapp -
  127. Byssoloma leucoblepharum Vainio
  128. #Lendemer & Knapp -,
  129. Byssoloma meadii S. Ekman
  130. #Lendemer & Knapp -,
  131. Calicium salicinum Pers.
  132. #Lendemer & Knapp -
  133. Caloplaca camptidia Zahlbr.
  134. #Skorepa et al. – Montgomery Co., oak woods.
  135. #Skorepa et al. – on bark.
  136. Caloplaca cerina Th. Fr.
  137. #Skorepa et al. – Garrett Co., on aspen trunks.
  138. #Skorepa et al. – on bark.
  139. Caloplaca citrina Th. Fr.
  140. #Skorepa et al. – Baltimore Co., on concrete bridge.
  141. #Skorepa et al. – on cement.
  142. #Biechele – lower eastern shore of Maryland.
  143. #E.G. Worthley Herbarium – Lichens of Soldiers Delight; Baltimore Co., on wall of stone and cement.
  144. Caloplaca feracissima H. Magn.
  145. #Skorepa et al. – Frederick Co., on concrete.
  146. #Skorepa et al. – on cement.
  147. #E.G. Worthley Herbarium – Lichens of Soldiers Delight.
  148. #E.C. Uebel Herbarium – Prince George's Co., on hill of concrete.
  149. Caloplaca flavorubescens J. R. Laundon
  150. #Syn.: Caloplaca aurantiaca Th. Fr.
  151. #Skorepa et al. – Allegany Co., on cement.
  152. #Skorepa et al. – on cement.
  153. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
  154. Caloplaca flavovirescens Dalla Torre & Sarnth.
  155. #Skorepa et al. – Washington Co., on limestone.
  156. #Skorepa et al. – on calcareous rock, cement.
  157. Caloplaca holocarpa M. Wade
  158. #Skorepa et al. – Frederick Co., on timbers.
  159. #Skorepa et al. – on bark, calcareous rock, wood.
  160. Caloplaca lobulata de Lesd.
  161. #Skorepa et al. – Cecil Co., on serpentine rock.
  162. #Skorepa et al. – acidic rock.
  163. #E.G. Worthley Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bricks.
  164. Caloplaca microphyllina Hasse
  165. #Skorepa et al. – wood.
  166. Caloplaca oxfordensis Fink
  167. #Skorepa et al. – Washington Co., on limestone.
  168. #Skorepa et al. – on acidic rock.
  169. Caloplaca sideritis Zahlbr.
  170. #Skorepa et al. – Frederick Co., on cement foundation.
  171. #Skorepa et al. – on acidic rock.
  172. #E.G. Worthley Herbarium – Lichens of Soldiers Delight.
  173. Caloplaca subsoluta Zahlbr.
  174. #Syn.: Caloplaca modesta Fink
  175. #Skorepa et al. – Montgomery Co.
  176. #Skorepa et al. – on acidic rock.
  177. Candelaria concolor B. Stein
  178. #Skorepa et al. – Allegany Co., on tree trunk.
  179. #Skorepa et al. – on bark.
  180. #E.G. Worthley Herbarium – Lichens of Soldiers Delight; Frederick Co.; Carroll Co.
  181. #E.C. Uebel Herbarium – Baltimore Co.; Prince George's Co., on bark.
  182. #Lendemer & Knapp -
  183. Candelariella reflexa Lettau
  184. #Lendemer & Knapp -
  185. Candelariella vitellina Müll. Arg.
  186. #Skorepa et al. – Baltimore Co., on rock face.
  187. #Skorepa et al. – on acidic rock.
  188. #E.G. Worthley Herbarium – Lichens of Soldiers Delight.
  189. Canoparmelia caroliniana Elix & Hale
  190. #Syn.: Parmelia caroliniana Nyl.
  191. #Skorepa et al. – Worcester Co., on tree trunks.
  192. #Biechele – lower eastern shore of Maryland.
  193. #Lendemer & Knapp -,,
  194. Canoparmelia crozalsiana Elix & Hale
  195. #Syn.: Parmelia crozalsiana B. de Lesd. ex Harm.
  196. #Skorepa et al. – Frederick Co., on trunk of oak.
  197. #Skorepa et al. – on bark.
  198. #E.G. Worthley Herbarium - Talbot Co., on Sycamore.
  199. #Lendemer & Knapp -
  200. Canoparmelia texana Elix & Hale
  201. #Syn.: Parmelia texana Tuck.
  202. #Skorepa et al. – Frederick Co., on trunk of maple.
  203. #Skorepa et al. – on bark.
  204. #Lendemer & Knapp -
  205. Catapyrenium cinereum Körber
  206. #Syn.: Dermatocarpon hepaticum Th. Fr.
  207. #Skorepa et al. – on soil.
  208. #E.G. Worthley Herbarium – Lichens of Soldiers Delight.
  209. Catillaria chalybeia A. Massal.
  210. #Skorepa et al. – Frederick Co., on rocks.
  211. #Skorepa et al. – on acidic rock.
  212. Cetraria arenaria Kärnefelt
  213. #Syn.: Cetraria islandica Ach.
  214. #Skorepa et al. – Garrett Co., on soil.
  215. #Skorepa et al. – on soil.
  216. #E.G. Worthley Herbarium - Garrett Co., Carey Run.
  217. Cetrelia cetrarioides Culb. & C. Culb.
  218. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills, on oak.
  219. Cetrelia chicitae W. Culb. & C. Culb.
  220. #Skorepa et al. – Garrett Co., on conglomerate.
  221. #Skorepa et al. – on bark, acidic rock.
  222. #E.G. Worthley Herbarium - Frederick Co., Mt. Catoctin Park.
  223. Cetrelia olivetorum Culb. & C. Culb.
  224. #Skorepa et al. – Allegany Co., on trunk of deciduous tree.
  225. #Skorepa et al. – on bark.
  226. Chrismofulvea dialyta Marbach
  227. #Syn.: Buellia dialyta Tuck.
  228. #Skorepa et al. – on bark.
  229. Chrysothrix candelaris J. R. Laundon
  230. #Syn.: Lepraria candelaris Fr.
  231. #Skorepa et al. – on bark.
  232. #E.G. Worthley Herbarium - Montgomery Co., on rock outcrop.
  233. #E.C. Uebel Herbarium – Baltimore Co., Hollofield, on rock cliff.
  234. #Lendemer & Knapp -
  235. Chrysothrix flavovirens Tønsberg s. lat.
  236. #Lendemer & Knapp -
  237. Cladonia apodocarpa Robbins
  238. #Skorepa et al. – Frederick Co., on soil.
  239. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Gunpowder Falls; Allegany Co.
  240. Cladonia arbuscula Flotow
  241. #Skorepa et al. – Lichens of Soldiers Delight.
  242. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Allegany Co., Green Ridge State Forest; Wicomico Co.
  243. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  244. Cladonia atlantica A. Evans
  245. #Skorepa et al. – Lichens of Soldiers Delight.
  246. #Biechele – lower eastern shore of Maryland.
  247. Cladonia beaumontii Vainio
  248. #Biechele – lower eastern shore of Maryland.
  249. Cladonia boryi Tuck.
  250. #Skorepa et al. – Lichens of Soldiers Delight.
  251. #This is probably a misidentification of Cladonia caroliniana.
  252. Cladonia caespiticia Flörke
  253. #Skorepa et al. – Worcester Co., on sandy soil.
  254. #Biechele – lower eastern shore of Maryland.
  255. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Carroll Co., Liberty Reservoir.
  256. Cladonia cariosa Sprengel
  257. #E.G. Worthley Herbarium - Lichens of Soldiers Delight.
  258. Cladonia caroliniana Tuck.
  259. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  260. Cladonia cervicornis subsp. verticillata Ahti
  261. #Syn.: Cladonia verticillata Schaer.
  262. #Skorepa et al. – Queen Anne's Co., on soil.
  263. #Biechele – lower eastern shore of Maryland.
  264. #E.G. Worthley Herbarium - Worcester Co.; Queen Anne's Co.; Baltimore Co.
  265. Cladonia chlorophaea Sprengel
  266. #Skorepa et al. – Lichens of Soldiers Delight.
  267. #Biechele – lower eastern shore of Maryland.
  268. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Prince George's Co.; Anne Arundel Co.; Washington Co.
  269. Cladonia coniocraea Sprengel
  270. #Skorepa et al. – Garrett Co., on base of pine.
  271. #Biechele – lower eastern shore of Maryland.
  272. #E.G. Worthley Herbarium - Baltimore Co.; Calvert Co.
  273. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., Liberty Reservoir.
  274. Cladonia cristatella Tuck.
  275. #Skorepa et al. – Lichens of Soldiers Delight.
  276. #Biechele – lower eastern shore of Maryland.
  277. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Prince George's Co.; Garrett Co., Swallow Falls.
  278. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
  279. Cladonia didyma Vainio var. didyma
  280. #Lendemer & Knapp -
  281. Cladonia fimbriata Fr.
  282. #Skorepa et al. – Garrett Co., on sandstone boulder.
  283. #E.G. Worthley Herbarium - Garrett Co.; Allegany Co., Green Ridge State Forest.
  284. Cladonia floerkeana Flörke
  285. #Skorepa et al. – Harford Co., on rotting wood.
  286. Cladonia furcata Schrader
  287. #Skorepa et al. – Harford Co., on moss.
  288. Cladonia gracilis Willd. subsp. gracilis
  289. #Skorepa et al. – Lichens of Soldiers Delight.
  290. #E.G. Worthley Herbarium - Lichens of Soldiers Delight.
  291. Cladonia grayi Merr. ex Sandst.
  292. #Biechele – lower eastern shore of Maryland.
  293. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  294. #Lendemer & Knapp -,
  295. Cladonia incrassata Flörke
  296. #Skorepa et al. – Wicomico Co., on sandy soil.
  297. #Lendemer & Knapp -,
  298. Cladonia macilenta Hoffm.
  299. #Skorepa et al. – Harford Co., on rotting wood.
  300. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir; Prince Georges Co., College Park.
  301. #Lendemer & Knapp -
  302. Cladonia macilenta var. bacillaris Schaerer
  303. #Syn.: Cladonia bacillaris Nyl.
  304. #Skorepa et al. – Lichens of Soldiers Delight.
  305. #Biechele – lower eastern shore of Maryland.
  306. #E.G. Worthley Herbarium - Prince George's Co.
  307. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir.
  308. #Lendemer & Knapp -
  309. Cladonia mateocyatha Robbins
  310. #Skorepa et al. – Baltimore Co., on exposed rocks.
  311. Cladonia ochrochlora Flörke
  312. #Lendemer & Knapp -
  313. Cladonia parasitica Hoffm.
  314. #Skorepa et al. – Worcester Co., on pine stump.
  315. #Biechele – lower eastern shore of Maryland.
  316. #Lendemer & Knapp -
  317. Cladonia peziziformis J.R. Laundon
  318. #Syn.: Cladonia capitata Spreng.
  319. #Skorepa et al. – Kent Co., on embankment.
  320. #Biechele – lower eastern shore of Maryland.
  321. #E.G. Worthley Herbarium - Lichens of Soldiers Delight.
  322. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
  323. Cladonia piedmontensis G. Merr.
  324. #Skorepa et al. – Wicomico Co., on soil.
  325. #E.G. Worthley Herbarium - Baltimore Co.; Wicomico Co.
  326. Cladonia pleurota Schaerer
  327. #Skorepa et al. – Lichens of Soldiers Delight.
  328. #Biechele – lower eastern shore of Maryland.
  329. Cladonia polycarpia G. Merr.
  330. #Lendemer & Knapp -
  331. Cladonia polycarpoides Nyl.
  332. #Biechele – lower eastern shore of Maryland.
  333. #Lendemer & Knapp -
  334. Cladonia pyxidata Hoffm.
  335. #Skorepa et al. – Allegany Co., on bank of stream.
  336. #E.G. Worthley Herbarium - Allegany Co., Green Ridge State Forest; Anne Arundel Co.; Carroll Co.; Washington Co.
  337. Cladonia ramulosa J.R. Laundon
  338. #E.G. Worthley Herbarium - Worcester Co., Milburn Landing.
  339. #Lendemer & Knapp -
  340. Cladonia rangiferina F.H. Wigg.
  341. #Skorepa et al. – Allegany Co., on soil.
  342. #E.G. Worthley Herbarium - Calvert Co.; Wicomico Co.
  343. Cladonia rappii A. Evans
  344. #Syn.: Cladonia calycantha Del. ex Nyl.
  345. #Skorepa et al. – Charles Co., on soil.
  346. #Biechele – lower eastern shore of Maryland.
  347. #E.G. Worthley Herbarium - Wicomico Co.
  348. Cladonia ravenelii Tuck.
  349. #Biechele – lower eastern shore of Maryland.
  350. Cladonia rei Schaerer
  351. #Syn.: Cladonia nemoxyna Nyl.
  352. #Skorepa et al. – Garrett Co., on rocky soil.
  353. #E.G. Worthley Herbarium - Garrett Co.
  354. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  355. Cladonia santensis Tuck.
  356. #Skorepa et al. – Dorchester Co., on soil.
  357. #Biechele – lower eastern shore of Maryland.
  358. Cladonia squamosa Hoffm.
  359. #Skorepa et al. – Frederick Co., on basalt outcrop.
  360. #Biechele – lower eastern shore of Maryland.
  361. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Washington Co.
  362. #Lendemer & Knapp -
  363. Cladonia stellaris Pouzar & Vezda
  364. #Syn.: Cladonia alpestris Rabenh.
  365. #Skorepa et al. – Garrett Co., on soil.
  366. Cladonia strepsilis Grognot
  367. #Skorepa et al. – Prince George's Co., on shoulder of road.
  368. #E.G. Worthley Herbarium - Prince George's Co.
  369. Cladonia subcariosa Nyl.
  370. #Syns.: Cladonia clavulifera Vain., C. sobolescens Nyl. ex Vain.
  371. #Skorepa et al. – Worcester Co., on sandy soil.
  372. #Skorepa et al. – Kent Co., on soil.
  373. #E.G. Worthley Herbarium - St. Mary's Co.; Wicomico Co.
  374. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
  375. #Lendemer & Knapp -
  376. Cladonia subtenuis Mattick
  377. #Skorepa et al. – Lichens of Soldiers Delight.
  378. #Biechele – lower eastern shore of Maryland.
  379. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Allegany Co.; Calvert County; St. Mary's Co.
  380. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co.
  381. #Lendemer & Knapp -,,
  382. Cladonia turgida Hoffm.
  383. #Skorepa et al. – Wicomico Co., on soil.
  384. Cladonia uncialis F.H. Wigg.
  385. #Skorepa et al. – Lichens of Soldiers Delight.
  386. #Biechele – lower eastern shore of Maryland.
  387. Coccocarpia palmicola Arv. & D.J. Galloway
  388. #Syn.: Coccocarpia cronia Vain.
  389. #Skorepa et al. – Montgomery Co., on rock outcrop.
  390. #Skorepa et al. – on bark, acidic rock.
  391. Coenogonium luteum Kalb & Lücking
  392. #Lendemer & Knapp -
  393. Coenogonium pineti Kalb & Lücking
  394. #Syn.: Dimerella diluta Trevisan
  395. #Skorepa et al. – on wood, other.
  396. #Lendemer & Knapp -
  397. Collema coccophorum Tuck.
  398. #Skorepa et al. – on acidic rock.
  399. Collema conglomeratum Hoffm.
  400. #Skorepa et al. – on bark.
  401. Collema furfuraceum Du Rietz
  402. #Skorepa et al. – Allegany Co., on trunks of deciduous trees.
  403. #Skorepa et al. – bark, acidic rock.
  404. #E.G. Worthley Herbarium - Allegany Co., Terrapin Run, near base of tree trunk.
  405. Collema fuscovirens J.R. Laundon
  406. #Syn.: Collema tuniforme Ach.
  407. #Skorepa et al. – on calcareous rock.
  408. Collema leptaleum Tuck.
  409. #Skorepa et al. – on bark.
  410. Collema subflaccidum Degel.
  411. #Skorepa et al. – acidic rock.
  412. #E.G. Worthley Herbarium - Baltimore Co., Gunpowder River, on bark of Tulip Tree.
  413. Collema undulatum Laurer ex Flotow
  414. #Skorepa et al. – on acidic rock.
  415. Cyphelium tigillare Ach.
  416. #Skorepa et al. – on wood.
  417. Dactylospora inquilina Hafellner
  418. #Lendemer & Knapp -
  419. Dermatocarpon luridum J.R. Laundon
  420. #Syn.: Dermatocarpon fluviatile Th. Fr.
  421. #Skorepa et al. – Baltimore Co., on rocks.
  422. #Skorepa et al. – on acidic rock.
  423. #E.G. Worthley Herbarium - Carroll Co., in stream bed; Frederick Co., on boulder in stream.
  424. #E.C. Uebel Herbarium – Baltimore Co., Hollofield, on moist rock.
  425. Dermatocarpon miniatum W. Mann
  426. #Skorepa et al. – Baltimore Co., on rock ledge.
  427. #Skorepa et al. – on acidic rock, calcareous rock.
  428. #E.G. Worthley Herbarium - Montgomery Co., Great Falls
  429. Dibaeis baeomyces Rambold & Hertel
  430. #Syn.: Baeomyces roseus Pers.
  431. #Skorepa et al. – Harford Co., on rock ledge.
  432. #Skorepa et al. – on soil.
  433. #Biechele – lower eastern shore of Maryland.
  434. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Howard Co.
  435. Dimelaena oreina Norman
  436. #Skorepa et al. – Allegany Co., on sandstone outcrop.
  437. #Skorepa et al. – on acidic rock.
  438. Diploschistes scruposus Norman
  439. #Skorepa et al. – on acidic rock.
  440. Dirinaria frostii Hale & Culb.
  441. #Skorepa et al. – Allegany Co., on shale outcrops.
  442. #Skorepa et al. – on acidic rock.
  443. Endocarpon petrolepideum Nyl.
  444. #E.C. Uebel Herbarium – Prince George's Co., Greenbelt, on hill of concrete.
  445. Endocarpon pusillum Hedwig
  446. #Skorepa et al. – Washington Co., on chert.
  447. #Skorepa et al. – on calcareous rock, cement.
  448. Ephebe lanata Vainio
  449. #Skorepa et al. – on acidic rock.
  450. Fissurina insidiosa Hook. & C. Knight
  451. #Lendemer & Knapp -,
  452. Flavoparmelia baltimorensis Hale
  453. #Syn.: Parmelia baltimorensis Gyelnik & Fóriss
  454. #Skorepa et al. – Baltimore Co., on rock outcrops.
  455. #Skorepa et al. – on acidic rock.
  456. #E.G. Worthley Herbarium - Harford Co., Rocks State Park, on acidic rock.
  457. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on boulders.
  458. Flavoparmelia caperata Hale
  459. #Syn.: Parmelia caperata Ach.
  460. #Skorepa et al. – Lichens of Soldiers Delight, on rocks.
  461. #Skorepa et al. – on bark, acidic rock.
  462. #Biechele – lower eastern shore of Maryland.
  463. #E.G. Worthley Herbarium - Calvert Co.; Frederick Co.; Worcester Co., on bark.
  464. #E.C. Uebel Herbarium – Prince George's Co., on fallen tree limbs.
  465. #Lendemer & Knapp -
  466. Flavopunctelia flaventior Hale
  467. #Syn.: Parmelia flaventior Stirt.
  468. #Skorepa et al. – Garrett Co., on oak.
  469. #Skorepa et al. – on bark.
  470. #E.G. Worthley Herbarium - Allegany Co.; Garrett Co., Casselman Bridge State Park.
  471. Flavopunctelia soredica Hale
  472. #Syn.: Parmelia ulophyllodes Savicz
  473. #Skorepa et al. – on bark.
  474. #E.G. Worthley Herbarium - Baltimore Co., Gunpowder State Park.
  475. #E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
  476. Fuscopannaria leucophaea P.M. Jørg.
  477. #Syn.: Parmeliella microphylla Müll. Arg.
  478. #Skorepa et al. – on acidic rock.
  479. Fuscopannaria leucosticta P.M. Jørg.
  480. #Syn.: Pannaria leucosticta Tuck. ex Nyl.
  481. #Skorepa et al. – on bark.
  482. Gassicurtia vernicoma Marbach
  483. #Syn.: Buellia vernicoma Tuck.
  484. #Skorepa et al. –
  485. #Skorepa et al. – on bark.
  486. Graphis scripta Ach.
  487. #Skorepa et al. – Montgomery Co., on oak.
  488. #Skorepa et al. – on bark.
  489. #E.G. Worthley Herbarium - Baltimore Co., Pretty Boy Reservoir; Wicomico Co.
  490. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on tree bark.
  491. Hafellia disciformis Marbach & H. Mayrhofer
  492. #Syn.: Buellia disciformis Mudd
  493. #Skorepa et al. – Anne Arundel Co.
  494. #Skorepa et al. – on bark.
  495. Hertelidea botryosa Printzen & Kantvilas
  496. #Syn.: Lecidea botryosa Th. Fr.
  497. #Skorepa et al. – on wood.
  498. Heterodermia albicans Swinscow & Krog
  499. #Syn.: Heterodermia domingensis Trev.
  500. #Skorepa et al. – Wicomico Co., on tree trunks.
  501. #Skorepa et al. – on bark.
  502. Heterodermia appalachensis Culb.
  503. #Skorepa et al. – Baltimore Co., on trunk of oak.
  504. Heterodermia granulifera Culb.
  505. #Skorepa et al. – Montgomery Co., on trunk of Walnut tree.
  506. #Skorepa et al. – on bark.
  507. Heterodermia hypoleuca Trevisan
  508. #Skorepa et al. – Frederick Co, on oak.
  509. #Skorepa et al. – on bark.
  510. #Biechele – lower eastern shore of Maryland.
  511. Heterodermia obscurata Trevisan
  512. #Skorepa et al. – Charles Co., on trunks of deciduous trees.
  513. #Skorepa et al. – on bark, acidic rock.
  514. #E.G. Worthley Herbarium - Baltimore Co., Gunpowder Falls, on tree trunk.
  515. #Lendemer & Knapp -,
  516. Heterodermia speciosa Trevisan
  517. #Syn.: Heterodermia tremulans W. Culb.
  518. #Skorepa et al. – Washington Co., on trunks of deciduous trees.
  519. #Skorepa et al. – on bark, acidic rock.
  520. #E.G. Worthley Herbarium - Baltimore Co., Pretty Boy Dam.
  521. #Lendemer & Knapp -,
  522. Hymenelia epulotica Lutzoni
  523. #Syn.: Ionaspis epulotica Blomb. & Forssell
  524. #Skorepa et al. – on acidic rock.
  525. Hyperphyscia adglutinata H. Mayrh.
  526. #Syn.: Physciopsis adglutinata M. Choisy
  527. #Skorepa et al. – on bark.
  528. Hyperphyscia syncolla Kalb
  529. #Syns.: Physcia syncolla Tuck. ex Nyl., Physciopsis syncolla Poelt
  530. #Skorepa et al. – Wicomico Co., on oak trees.
  531. #Skorepa et al. – on bark.
  532. #Biechele – lower eastern shore of Maryland.
  533. Hypocenomyce scalaris M. Choisy
  534. #Syn.: Lecidea scalaris Ach.
  535. #Skorepa et al. – on bark, wood.
  536. #E.G. Worthley Herbarium - Lichens of Soldiers Delight, on trunk of pine.
  537. Hypogymnia krogiae Ohlsson
  538. #Skorepa et al. – Garrett Co., on conifer bark.
  539. #Skorepa et al. – on bark.
  540. Hypogymnia physodes Nyl.
  541. #Skorepa et al. – Garrett Co., on tree trunks.
  542. #Skorepa et al. – on bark, acidic rock.
  543. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
  544. Hypotrachyna livida Hale
  545. #Syn.: Parmelia livida Taylor
  546. #Skorepa et al. – Sommerset Co., on branches of deciduous trees.
  547. #Skorepa et al. – on bark.
  548. #Biechele – lower eastern shore of Maryland.
  549. #E.G. Worthley Herbarium - Wicomico Co.; Worcester Co., Milburn Landing, on branches.
  550. #Lendemer & Knapp -,,
  551. Hypotrachyna osseoalba Park & Hale
  552. #Syn.: Parmelia formosana Zahlbr.
  553. #Skorepa et al. – Dorchester Co., on oak trunk.
  554. #Skorepa et al. – on bark.
  555. #Lendemer & Knapp -
  556. Imshaugia aleurites S.F. Meyer
  557. #Syn.: Parmeliopsis aleurites Nyl.
  558. #Skorepa et al. – Garrett Co., on oak trunk.
  559. #Skorepa et al. – on bark, acidic rock, wood.
  560. #E.G. Worthley Herbarium - Lichens of Soldiers Delight, on Virginia pines.
  561. #E.C. Uebel Herbarium – Lichens of Soldiers Delight, on trunks of pines.
  562. Imshaugia placorodia S.F. Meyer
  563. #Syn.: Parmeliopsis placorodia Nyl.
  564. #Skorepa et al. – Harford Co., on pine trees.
  565. #Skorepa et al. – on bark.
  566. #E.G. Worthley Herbarium - Lichens of Soldiers Delight, on pine branches.
  567. #E.C. Uebel Herbarium – Lichens of Soldiers Delight, on branches of Virginia pines.
  568. Julella fallaciosa R.C. Harris
  569. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of Tulip Tree.
  570. Lasallia papulosa Llano
  571. #Syn.: Umbilicaria papulosa Nyl.
  572. #Skorepa et al. – Baltimore Co., on rocks on hillside.
  573. #Skorepa et al. – on bark, acidic rock.
  574. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls; Montgomery Co., Great Falls.
  575. Lasallia pensylvanica Llano
  576. #Syn.: Umbilicaria pensylvanica Hoffm.
  577. #Skorepa et al. – Harford Co., on rock outcrops.
  578. #Skorepa et al. – on acidic rock.
  579. #E.G. Worthley Herbarium - Washington Co., Wash. Monument State Park, on rocks.
  580. Lasallia pustulata Mérat
  581. #E.G. Worthley Herbarium - Frederick Co., South Mt.; Montgomery Co., Sugarloaf Mt., on boulders.
  582. Lecanora albella Ach. var. albella
  583. #E.G. Worthley Herbarium - Worcester Co., on bark of Pinus taeda.
  584. Lecanora cadubriae Hedl.
  585. #Skorepa et al. – on bark.
  586. Lecanora caesiorubella Ach. subsp. caesiorubella
  587. #Skorepa et al. – Harford Co., on trunk of oak.
  588. #Skorepa et al. – on bark.
  589. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Wicomico Co.
  590. Lecanora campestris Hue
  591. #Skorepa et al. – Allegany Co., on shale outcrop.
  592. #Skorepa et al. – on acidic rock.
  593. Lecanora chlarotera Nyl.
  594. #Skorepa et al. – Calvert Co., on trunks of deciduous trees.
  595. #Skorepa et al. – on bark.
  596. #Biechele – lower eastern shore of Maryland.
  597. Lecanora cinereofusca H. Magn.
  598. #Lendemer & Knapp -,,
  599. Lecanora dispersa Sommerf.
  600. #Skorepa et al. – Washington Co., on stone wall.
  601. #Skorepa et al. – on calcareous rock, cement, other.
  602. #E.G. Worthley Herbarium - Baltimore Co.; Washington Co., on rock outcrops.
  603. Lecanora expallens Ach.
  604. #Syn.: Lecanora conizea Nyl.
  605. #Skorepa et al. – St. Mary's Co., on trunks of Black Locust.
  606. #Skorepa et al. – on bark, wood.
  607. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; St. Mary' Co., on trunk of Black Locust.
  608. Lecanora hagenii Ach.
  609. #Skorepa et al. – Frederick Co., on old timbers.
  610. #Skorepa et al. – on wood.
  611. Lecanora hybocarpa Brodo
  612. #Biechele – lower eastern shore of Maryland.
  613. #Lendemer & Knapp -,,,
  614. Lecanora imshaugii Brodo
  615. #Biechele – lower eastern shore of Maryland.
  616. Lecanora minutella Nyl.
  617. #Lendemer & Knapp -
  618. Lecanora muralis Rabenh.
  619. #Skorepa et al. – Montgomery Co., on rock ledges.
  620. Lecanora muralis var. versicolor Tuck.
  621. #Syn.: Lecanora versicolor Ach.
  622. #Skorepa et al. – Washington Co., on stone wall.
  623. #Skorepa et al. – on acidic rock.
  624. #Skorepa et al. – on acidic rock, calcareous rock.
  625. #E.G. Worthley Herbarium - Washington Co., C & 0 canal, on shale.
  626. Lecanora polytropa Rabenh.
  627. #Skorepa et al. – on acidic rock.
  628. Lecanora pulicaris Ach.
  629. #Syn.: Lecanora coilocarpa Nyl.
  630. #Skorepa et al. – Calvert Co., on deciduous trees.
  631. #Skorepa et al. – on bark.
  632. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
  633. Lecanora strobilina Kieffer
  634. #Biechele – lower eastern shore of Maryland.
  635. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple; Prince George's Co., on bark of pines.
  636. #Lendemer & Knapp -
  637. Lecanora subpallens Zahlbr. -
  638. #Lendemer & Knapp -,,
  639. Lecanora thysanophora R.C. Harris
  640. #Thomas E. Wilson, III – IMG_9960.JPG, photographed on tree trunk in woodland on eastern side of Baltimore County, MD.
  641. #Lendemer & Knapp -,
  642. Lecanora xylophila Hue
  643. #Syn.: Lecanora laevis Poelt
  644. #Skorepa et al. – Baltimore Co., on wave-washed timbers.
  645. #Skorepa et al. – on wood.
  646. Lecidea cyrtidia Tuck.
  647. #Skorepa et al. – Washington Co., on rocks.
  648. #Skorepa et al. – on acidic rock.
  649. Lecidea plebeja Nyl.
  650. #Syn.: Lecidea myriocarpoides Nyl.
  651. #Skorepa et al. – on wood.
  652. #Lendemer & Knapp -
  653. Lecidella stigmatea Hertel & Leuckert
  654. #Syn.: Lecidea stigmatea Ach.
  655. #Skorepa et al. – on acidic rock.
  656. Lepraria caesiella R.C. Harris
  657. #Lendemer & Knapp -,
  658. Lepraria aff. incana Ach.
  659. #Lendemer & Knapp -,
  660. Lepraria lobificans Nyl.
  661. #Syn.: Lepraria finkii R.C. Harris
  662. #E.G. Worthley Herbarium - Baltimore Co., Gunpowder River Area, on Quercus alba.
  663. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, rock near water.
  664. #Lendemer & Knapp -,
  665. Lepraria membranacea Vainio
  666. #Syn.: Leproloma membranaceum Vainio
  667. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
  668. Lepraria neglecta Erichsen
  669. #Syn.: Lepraria zonata Brodo = L.caesioalba or L. neglecta.
  670. #Skorepa et al. – Baltimore Co., on acid rocks.
  671. #Skorepa et al. – on bark, acidic rock.
  672. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls; Montgomery Co., Great Falls.
  673. Leptogium azureum Mont.
  674. #Skorepa et al. – Montgomery Co., Plummers Is..
  675. #Skorepa et al. – on acidic rock.
  676. Leptogium cyanescens Körber
  677. #Skorepa et al. – Worcester Co., on trunks of deciduous trees.
  678. #Skorepa et al. – on bark, acidic rock.
  679. #Biechele – lower eastern shore of Maryland.
  680. #E.G. Worthley Herbarium - Baltimore Co., Gunpowder River, on vertical rocks; Frederick Co., Cunningham Falls.
  681. #Lendemer & Knapp -,
  682. Leptogium lichenoides Zahlbr.
  683. #Skorepa et al. – Allegany Co., on bark of deciduous trees.
  684. #Skorepa et al. – on bark, acidic rock.
  685. Leptogium phyllocarpum Mont.
  686. #Biechele – lower eastern shore of Maryland.
  687. Leptogium subtile Torss.
  688. #Syn.: Leptogium minutissimum Fr.
  689. #Skorepa et al. – Montgomery Co., on rock ledge.
  690. #Skorepa et al. – on acidic rock.
  691. Lichenoconium erodens M.S. Christ. & D. Hawksw.
  692. #Lendemer & Knapp -
  693. Lichenodiplis lecanorae Dyko & D. Hawksw.
  694. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, a specimen of Pertusaria xanthodes U-243, was collected growing on a small dead oak branch. This crustose lichen contained a lichenicolous fungus and a sample of this fungus was sent to the Farlow Herbarium where it was forwarded to Dr. David Hawksworth, who identified it as Lichenodiplis lecanorae.
  695. Lobaria pulmonaria Hoffm.
  696. #Skorepa et al. – on bark.
  697. #Biechele – lower eastern shore of Maryland.
  698. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
  699. Lobaria quercizans Michaux
  700. #Skorepa et al. – Garrett Co., on trunk of deciduous tree.
  701. #Skorepa et al. – on bark.
  702. #Biechele – lower eastern shore of Maryland.
  703. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
  704. #Lendemer & Knapp -
  705. Loxospora pustulata R.C. Harris
  706. #Lendemer & Knapp -,
  707. Melanelia culbersonii Thell
  708. #Syn.: Cetraria culbersonii Hale
  709. #Skorepa et al. – Allegany Co., on exposed rock.
  710. #Skorepa et al. – on acidic rock.
  711. #E.G. Worthley Herbarium - Allegany Co., Dans Rock Overlook.
  712. Melanelixia subaurifera O. Blanco et al.
  713. #Syns.: Parmelia subaurifera Nyl., Melanelia subaurifera Essl.
  714. #Skorepa et al. – Allegany Co., on deciduous trees.
  715. #Skorepa et al. – on bark.
  716. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
  717. Melanohalea exasperata O. Blanco et al..
  718. #Syns.: Parmelia exasperata De Not., Melanelia exasperata Essl.
  719. #Skorepa et al. – on bark.
  720. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
  721. Metamelanea melambola Henssen
  722. #Syn.Pyrenopsis melambola Tuck.
  723. #Skorepa et al. – on calcareous rock.
  724. Micarea erratica Hertel, Rambold & Pietschmann
  725. #Syn.: Lecidea erratica Körber
  726. #Skorepa et al. – Baltimore Co., on pebbles.
  727. #Skorepa et al. – on acidic rock.
  728. #E.G. Worthley Herbarium - Garrett Co., Carey Run, in open field.
  729. #Lendemer & Knapp -
  730. Minutoexcipula mariana V. Atienza*
  731. #Lendemer & Knapp -
  732. Mycobilimbia berengeriana Hafellner & V. Wirth
  733. #Syn.: Lecidea berengeriana Nyl.
  734. #Skorepa et al. – Frederick Co., on oak trunks.
  735. #Skorepa et al. – on bark.
  736. #E.G. Worthley Herbarium - Montgomery Co., Great Falls, on old wood.
  737. Myelochroa aurulenta Elix & Hale
  738. #Syns: Parmelia aurulenta Tuck.
  739. #Skorepa et al. – Baltimore Co., on rocks.
  740. #Skorepa et al. – on bark, acidic rock.
  741. #E.G. Worthley Herbarium - Baltimore Co., along Gunpowder River, on rock outcrops.
  742. #E.C. Uebel Herbarium – Baltimore County, Liberty Reservoir; Prince George's Co., on bark.
  743. #Lendemer & Knapp -,
  744. Myelochroa galbina Elix & Hale
  745. #Syn.: Parmelia galbina Ach.
  746. #Skorepa et al. – Allegany Co., on trunks of deciduous trees.
  747. #Skorepa et al. – on bark.
  748. #E.G. Worthley Herbarium - Allegany Co., along Terrapin Run, on trunks of deciduous trees.
  749. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  750. Myelochroa metarevoluta Elix & Hale
  751. #Syn.: Parmelia metarevoluta Hale
  752. #Skorepa et al. – Montgomery Co., on oak trunk.
  753. #Skorepa et al. – on bark.
  754. Myelochroa obsessa Elix & Hale
  755. #Syn.: Parmelia obsessa Ach.
  756. #Skorepa et al. – Baltimore Co., on acid rocks.
  757. #Skorepa et al. – on bark, acidic rock.
  758. #E.G. Worthley Herbarium - Baltimore Co., near Little Gunpowder River, on rock ledges.
  759. Nadvornikia sorediata R.C. Harris
  760. #Lendemer & Knapp -,,
  761. Nephroma helveticum Ach. subsp. helveticum
  762. #Skorepa et al. – Montgomery Co., Plummers Is..
  763. #Skorepa et al. – on acidic rock.
  764. Normandina pulchella Nyl.
  765. #Skorepa et al. – on bark.
  766. Ochrolechia androgyna Arnold
  767. #Skorepa et al. – Anne Arundel Co.
  768. #Skorepa et al. – on acidic rock.
  769. Ochrolechia cinera Chev.
  770. #Biechele – lower eastern shore of Maryland.
  771. Ochrolechia pseudopallescens Brodo
  772. #Lendemer & Knapp -
  773. Ochrolechia trochophora var. trochophora Oshio
  774. #Syn.: Ochrolechia rosella Vers.
  775. #Biechele – lower eastern shore of Maryland.
  776. Ochrolechia yasudae Vainio
  777. #Skorepa et al. – Frederick Co..
  778. #Skorepa et al. – on acidic rock.
  779. Opegrapha varia Pers.
  780. #Lendemer & Knapp -
  781. Opegrapha viridis Pers.
  782. #Lendemer & Knapp -
  783. Opegrapha vulgata Ach.
  784. #Lendemer & Knapp -,,
  785. Pannaria conoplea Bory
  786. #Syn.: Pannaria pityrea auct.
  787. #Skorepa et al. – on bark.
  788. Pannaria lurida Nyl.
  789. #Skorepa et al. – on bark.
  790. #Biechele – lower eastern shore of Maryland.
  791. Parmelia saxatilis Ach.
  792. #Skorepa et al. – Frederick Co., in mature oak woods.
  793. #Skorepa et al. – on bark, acidic rock.
  794. #E.G. Worthley Herbarium - Baltimore Co., along Gunpowder River, on bark of Quercus velutina.
  795. Parmelia squarrosa Hale
  796. #Skorepa et al. – Garrett Co., on Acer.
  797. #Skorepa et al. – on bark.
  798. #Lendemer & Knapp -
  799. Parmelia sulcata Taylor
  800. #Skorepa et al. – Washington Co., on deciduous trees.
  801. #Skorepa et al. – on bark, acidic rock.
  802. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Carroll Co., on bark of Fraxinus americana.
  803. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
  804. Parmelinopsis horrescens Elix & Hale
  805. #Syn.: Parmelia horrescens Taylor
  806. #Skorepa et al. – Calvert Co., on trunks of pines.
  807. #Skorepa et al. – on bark.
  808. #E.G. Worthley Herbarium - Worcester Co., Milburn Landing, on bark of Pinus taeda.
  809. #Lendemer & Knapp -,,
  810. Parmelinopsis minarum Elix & Hale
  811. #Syn.: Parmelia dissecta Nyl.
  812. #Skorepa et al. – Frederick Co., on oak trunk.
  813. #Skorepa et al. – on bark, acidic rock.
  814. #E.G. Worthley Herbarium - Lichens of Soldiers Delight.
  815. #Lendemer & Knapp -,
  816. Parmeliopsis ambigua Nyl.
  817. #Skorepa et al. – Garrett Co., on trunk of deciduous tree.
  818. #Skorepa et al. – on bark.
  819. #E.G. Worthley Herbarium - Worcester Co., Milburn Landing, on bark of Pinus taeda.
  820. Parmeliopsis hyperopta Arnold
  821. #Syn.: Parmeliopsis diffusa Riddle
  822. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
  823. Parmeliopsis subambigua Gyelnik
  824. #Syn.: Parmeliopsis halei Hale
  825. #Skorepa et al. – Worcester Co., on pine trunks.
  826. #Skorepa et al. – on bark.
  827. #Lendemer & Knapp -,
  828. Parmotrema cetratum Hale
  829. #Syns.: Parmelia cetrata Ach, Rimelia cetrata Hale & Fletcher
  830. #Skorepa et al. – Worcester Co., on trunk of Sweet gum.
  831. #Skorepa et al. – on bark.
  832. Parmotrema chinense Hale & Ahti
  833. #Syn.: Parmotrema perlatum Choisy
  834. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple, on oak limb.
  835. Parmotrema crinitum M. Choisy
  836. #Syn.: Parmelia crinita Ach.
  837. #Skorepa et al. – Worcester Co., on trunk of pine.
  838. #Skorepa et al. – on bark.
  839. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills, on trees.
  840. Parmotrema dilatatum Hale
  841. #Syn.: Parmelia dilatata Vainio
  842. #Skorepa et al. – Dorchester Co., on trunks of deciduous trees.
  843. #Skorepa et al. – on bark.
  844. Parmotrema eurysacum Hale
  845. #Syn.: Parmelia eurysaca Hue
  846. #Skorepa et al. – Baltimore Co..
  847. #Skorepa et al. – on bark.
  848. Parmotrema gardneri Serux.
  849. #Biechele – lower eastern shore of Maryland.
  850. Parmotrema hypoleucinum Hale
  851. #Biechele – lower eastern shore of Maryland.
  852. Parmotrema hypoleucinum Hale
  853. #Lendemer & Knapp -,
  854. Parmotrema hypotropum Hale
  855. #Syn.: Parmelia hypotropa Nyl.
  856. #Skorepa et al. – Kent Co., on trees.
  857. #Skorepa et al. – on bark.
  858. #Biechele – lower eastern shore of Maryland.
  859. #E.G. Worthley Herbarium - Kent Co., on trees; Somerset Co., on deciduous trees; Wicomico Co.; Worcester Co., on bark of Pinus taeda.
  860. #E.C. Uebel Herbarium – Baltimore Co.; Prince George's Co., on bark and boulder.
  861. #Lendemer & Knapp -,,,
  862. Parmotrema margaritatum Hale
  863. #Syn.: Parmelia margaritata Hue
  864. #Skorepa et al. – on bark.
  865. Parmotrema perforatum A. Massal.
  866. #Syn.: Parmelia perforata Ach.
  867. #Skorepa et al. – Charles Co., on deciduous trees.
  868. #Skorepa et al. – on bark.
  869. #Biechele – lower eastern shore of Maryland.
  870. #E.G. Worthley Herbarium - Prince George's Co., on bark of oak; Worcester Co., Milburn Landing.
  871. #Lendemer & Knapp -
  872. Parmotrema reticulatum M. Choisy
  873. #Syns.: Parmelia reticulata Taylor, Rimelia reticulata Hale & Fletcher
  874. #Skorepa et al. – Charles Co., on deciduous trees.
  875. #Skorepa et al. – on bark.
  876. #Biechele – lower eastern shore of Maryland.
  877. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Worcester Co., on bark of Taxodium and Acer rubrum.
  878. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  879. Parmotrema stuppeum Hale
  880. #Syn.: Parmelia stuppea Taylor
  881. #Skorepa et al. – Garrett Co., on trunk of oak.
  882. #Skorepa et al. – on bark.
  883. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
  884. Parmotrema subisidiosum Hale
  885. #Biechele – lower eastern shore of Maryland.
  886. #Lendemer & Knapp -,,
  887. Parmotrema submarginale DePriest & Hale
  888. #Syn.: Parmelia michauxiana Zahlbr.
  889. #Skorepa et al. – Charles Co., on deciduous trees.
  890. #Skorepa et al. – on bark.
  891. #E.G. Worthley Herbarium - Calvert Co., Battle Creek Cypress Swamp, on bark; Worcester Co., Milburn Landing, on deciduous trees.
  892. #Lendemer & Knapp -,,
  893. Parmotrema subtinctorium Hale
  894. #Syn.: Parmelia subcrinita Nyl.
  895. #Skorepa et al. – Somerset Co., on deciduous trees.
  896. #Skorepa et al. – on bark.
  897. Parmotrema xanthinum Hale
  898. #Syn.: Parmelia xanthina Vainio
  899. #Skorepa et al. – on bark.
  900. #Biechele – lower eastern shore of Maryland.
  901. #Lendemer & Knapp -
  902. Peltigera aphthosa Willd.
  903. #Skorepa et al. – No County,.
  904. Peltigera canina Willd.
  905. #Skorepa et al. – Garrett Co., with moss on sandstone.
  906. #E.G. Worthley Herbarium - Garrett Co., Casselman Bridge State Park, on sandstone rocks; Wicomico Co., on sandy soil.
  907. Peltigera didactyla J. R. Laundon
  908. #Syn.: Peltigera spuria DC.
  909. #Skorepa et al. – Washington Co., on rock in seepage area.
  910. Peltigera elisabethae Gyelnik
  911. #Skorepa et al. – Baltimore Co., with moss on wet rocks.
  912. Peltigera evansiana Gyelnik
  913. #Skorepa et al. – Baltimore Co.,.
  914. Peltigera horizontalis Baumg.
  915. #Skorepa et al. – Baltimore Co.,.
  916. Peltigera neckeri Müll. Arg.
  917. #Biechele – lower eastern shore of Maryland.
  918. Peltigera polydactylon Hoffm.
  919. #Skorepa et al. – Garrett Co., on moss covered rocks.
  920. Peltigera praetextata Zopf
  921. #Skorepa et al. – Dorchester Co., at base of tree.
  922. #Biechele – lower eastern shore of Maryland.
  923. #Lendemer & Knapp -
  924. Peltigera rufescens Humb.
  925. #Biechele – lower eastern shore of Maryland.
  926. Peltula euploca Poelt
  927. #Skorepa et al. – on soil.
  928. Pertusaria amara Nyl.
  929. #Skorepa et al. – on bark.
  930. Pertusaria epixantha R.C. Harris
  931. #Lendemer & Knapp -
  932. Pertusaria globularis Tuck.
  933. #Skorepa et al. – on other.
  934. Pertusaria hypothamnolica Dibben
  935. #Skorepa et al. – on bark.
  936. Pertusaria macounii Dibben
  937. #Skorepa et al. – on bark.
  938. Pertusaria multipunctoides Dibben
  939. #Skorepa et al. – on bark.
  940. #Biechele – lower eastern shore of Maryland.
  941. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on trunk of Carya.
  942. #Lendemer & Knapp -
  943. Pertusaria ophthalmiza Nyl.
  944. #Biechele – lower eastern shore of Maryland.
  945. #Lendemer & Knapp -
  946. Pertusaria paratuberculifera Dibben
  947. #Pertusaria tuberculifera Nyl is misidentification for N.A., most specimens are P. paratuberculifera.
  948. #Skorepa et al. – Frederick Co., on oak trunks.
  949. #Skorepa et al. – on bark.
  950. #Lendemer & Knapp -,,,
  951. Pertusaria plittiana Erichsen
  952. #Skorepa et al. – on acidic rock.
  953. Pertusaria propinqua Müll. Arg.
  954. #Skorepa et al. – on bark.
  955. #Lendemer & Knapp -
  956. Pertusaria pustulata Duby
  957. #Skorepa et al. – on bark.
  958. #E.C. Uebel Herbarium – Prince George's Co., on dead limb of deciduous tree.
  959. #Lendemer & Knapp -
  960. Pertusaria rubefacta Erichsen
  961. #Skorepa et al. – on bark.
  962. Pertusaria subpertusa Brodo
  963. #Skorepa et al. – on bark.
  964. #Lendemer & Knapp -,
  965. Pertusaria tetrathalamia Nyl.
  966. #Skorepa et al. – on bark.
  967. Pertusaria texana Müll. Arg.
  968. #Skorepa et al. – on bark.
  969. #Lendemer & Knapp -
  970. Pertusaria trachythallina Erichsen
  971. #Skorepa et al. – on bark.
  972. Pertusaria velata Nyl.
  973. #Skorepa et al. – Frederick Co., in oak woods.
  974. #Skorepa et al. – on bark.
  975. #Lendemer & Knapp -,,
  976. Pertusaria waghornei Hulting
  977. #Skorepa et al. – on bark.
  978. Pertusaria xanthodes Müll. Arg.
  979. #Skorepa et al. – Harford Co., on tree bark.
  980. #Skorepa et al. – on bark.
  981. #E.G. Worthley Herbarium - Calvert Co.; Frederick Co.; Washington Co., on bark of Quercus velutina.
  982. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of dead oak branch.
  983. Phaeocalicium curtisii Tibell
  984. #E.G. Worthley Herbarium - Baltimore Co., on twigs of Rhus glabra.
  985. Phaeocalicium polyporaeum Tibell
  986. #E.C. Uebel Herbarium – a specimen of Violet Toothed Polypore was collected with Flavoparmelia caperata growing on the bark of a fallen oak tree at Liberty Reservoir in Baltimore County. The T. biforme had a stubble lichen growing on it which was identified by Dr. Steven Selva as Phaeocalicium polyporaeum.
  987. #Lendemer & Knapp -,,
  988. Phaeographis inusta Müll. Arg.
  989. #Lendemer & Knapp -,
  990. Phaeophyscia adiastola Essl.
  991. #Syns.: Physcia orbicularis Poetsch; Phaeophyscia orbicularis Moberg
  992. #Skorepa et al. – Allegany Co., on oak trunk.
  993. #Skorepa et al. – on bark, acidic rock, other.
  994. #E.G. Worthley Herbarium – Worcester Co., on bark of Taxodium; Frederick Co., Cunningham Falls; Baltimore Co., Church of the Brethren.
  995. Phaeophysica ciliata Moberg
  996. #Syn.: Physcia ciliata Du Rietz
  997. #Skorepa et al. – Caroline Co., on cement bridge.
  998. #Skorepa et al. – on bark.
  999. Phaeophyscia hirsuta Essl.
  1000. #Syns.: Physcia hirsuta Mereschk., Phaeophyscia cernohorskyi Essl.
  1001. #Skorepa et al. – on cement.
  1002. Phaeophyscia hirtella Essl.
  1003. #Skorepa et al. – on bark.
  1004. Phaeophyscia hispidula Essl.
  1005. #Syn.: Phaeophyscia imbricata Vainio
  1006. #Skorepa et al. – on bark.
  1007. Phaeophyscia pusilloides Essl.
  1008. #Syn.: Physcia pusilloides Zahlbr.
  1009. #Skorepa et al. – Frederick Co., on trees.
  1010. #Skorepa et al. – on bark.
  1011. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bark of Norway Maple;
  1012. Phaeophyscia rubropulchra Essl.
  1013. #Syn.: Physcia orbicularis f. rubropulchra Degel.
  1014. #Skorepa et al. – Garrett Co., in upland woods.
  1015. #Skorepa et al. – on bark, acidic rock, other.
  1016. #Biechele – lower eastern shore of Maryland.
  1017. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., Liberty Reservoir, on trunk of Tulip tree.
  1018. #Lendemer & Knapp -,
  1019. Phlyctis ludoviciensis Lendemer
  1020. #Lendemer & Knapp -
  1021. Physcia adscendens H. Olivier
  1022. #Skorepa et al. – Allegany Co., on deciduous trees.
  1023. #Skorepa et al. – on bark, calcareous rock.
  1024. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., St. Thomas Cemetery, on gravestone.
  1025. Physcia aipolia Fürnr. var. aipolia
  1026. #Skorepa et al. – Worcester Co., on deciduous trees.
  1027. #Skorepa et al. – on bark.
  1028. #Biechele – lower eastern shore of Maryland.
  1029. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Frederick Co., Cunningham Falls.
  1030. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on bark; Baltimore Co., on Norway Maple.
  1031. Physcia americana G. Merr.
  1032. #Syn.: Physcia tribacoides Nyl.
  1033. #Skorepa et al. – Worcester Co., on deciduous trees.
  1034. #Skorepa et al. – on bark, acidic rock, calcareous rock.
  1035. #E.G. Worthley Herbarium - Baltimore Co., Grace Methodist Church, Gunpowder River, on Tulip Tree; Frederick Co., Cunningham Falls.
  1036. #Lendemer & Knapp -,
  1037. Physcia millegrana Degel.
  1038. #Skorepa et al. – Garrett Co., on oak.
  1039. #Skorepa et al. – on bark, acidic rock.
  1040. #Biechele – lower eastern shore of Maryland.
  1041. #E.G. Worthley Herbarium - Calvert Co.; Wicomico Co.; Carroll Co., Falls Realty Company, on cement steps.
  1042. #E.C. Uebel Herbarium – Prince Georges Co., on dead limb; Carroll Co., Liberty Reservoir, on bark.
  1043. #Lendemer & Knapp -
  1044. Physcia phaea J.W. Thomson
  1045. #Skorepa et al. – Baltimore Co.,
  1046. #Skorepa et al. – on acidic rock.
  1047. Physcia pseudospeciosa J.W. Thomson
  1048. #Skorepa et al. – Baltimore Co., on acid rocks.
  1049. #Skorepa et al. – on acidic rock.
  1050. #E.G. Worthley Herbarium - Baltimore Co., near Gunpowder River, on vertical acidic rocks.
  1051. Physcia pumilior R.C. Harris
  1052. #Lendemer & Knapp -
  1053. Physcia stellaris Nyl.
  1054. #Skorepa et al. – Baltimore Co., on oak.
  1055. #Skorepa et al. – on bark.
  1056. #Biechele – lower eastern shore of Maryland.
  1057. #E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple; Prince George's Co., on bark.
  1058. Physcia subtilis Degel.
  1059. #Skorepa et al. – Montgomery Co., on rock ledges.
  1060. #Skorepa et al. – on acidic rock.
  1061. #E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
  1062. Physciella chloantha Essl.
  1063. #Syn.: Physcia luganensis Mereschk.
  1064. #Skorepa et al. – Queen Anne's Co., on cement bridge.
  1065. #Skorepa et al. – on bark, cement.
  1066. #E.C. Uebel Herbarium – Prince George's Co., along bike path, on concrete; on tree branch.
  1067. Physconia detersa Poelt
  1068. #Skorepa et al. – on bark, calcareous rock, cement.
  1069. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Green Spring Valley, on brick wall; on old cement bridge.
  1070. Placidium arboreum Lendemer
  1071. #Syn.: Dermatocarpon tuckermanii Zahlbr.; Placidium tuckermanii Breuss
  1072. #Skorepa et al. – Allegany Co., base of White Oak.
  1073. #Skorepa et al. – on bark.
  1074. #E.G. Worthley Herbarium - Allegany Co., Green Ridge State Forest, on base of White Oak.
  1075. Placidium lachneum Breuss
  1076. #E.G. Worthley Herbarium - Lichens of Soldiers Delight.
  1077. Placynthiella uliginosa Coppins & P. James
  1078. #Syn.: Lecidea uliginosa Ach.
  1079. #Skorepa et al. – Dorchester Co., on oak trunk.
  1080. #Skorepa et al. – on bark.
  1081. #Biechele – lower eastern shore of Maryland.
  1082. #Lendemer & Knapp -
  1083. Placynthium nigrum Gray
  1084. #Skorepa et al. – Garrett Co., on block of cement.
  1085. #Skorepa et al. – on calcareous rock, cement.
  1086. #E.G. Worthley Herbarium - Baltimore Co., St. Thomas Church Cemetery, on rock wall.
  1087. Platismatia tuckermanii Culb. & C. Culb.
  1088. #Skorepa et al. – Garrett Co., on sandstone boulder.
  1089. #Skorepa et al. – on bark, acidic rock, wood
  1090. Polysporina simplex Vezda
  1091. #Syn.: Sarcogyne simplex Nyl.
  1092. #Skorepa et al. – on acidic rock.
  1093. #E.G. Worthley Herbarium - Howard Co., on rock outcrop.
  1094. Porina cestrensis Müll. Arg.
  1095. #Skorepa et al. – on bark.
  1096. Porina heterospora R.C. Harris
  1097. #Lendemer & Knapp -,
  1098. Porpidia albocaerulescens Hertel & Knoph
  1099. #Syn.: Lecanora albocaerulescens Ach.
  1100. #Skorepa et al. – Lichens of Soldiers Delight.
  1101. #Skorepa et al. – on acidic rock.
  1102. #E.G. Worthley Herbarium - Baltimore Co., near small bridge, on Wissahickon schist; Frederick Co.; Garrett Co., on rocks along Big Run.
  1103. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on sandstone boulder.
  1104. Porpidia crustulata? Hertel & Knoph
  1105. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  1106. Porpidia macrocarpa Hertel & A. J. Schwab
  1107. #Syn.: Lecidea macrocarpa Steud.
  1108. #Skorepa et al. – Garrett Co., on sandstone.
  1109. #Skorepa et al. – on acidic rock.
  1110. Protoblastenia rupestris J. Steiner
  1111. #Skorepa et al. – on calcareous rock, cement.
  1112. Pseudevernia consocians Hale & Culb.
  1113. #Syn.: Parmelia furfuracea Ach.
  1114. #Skorepa et al. – Garrett Co., on upper branches of Hemlock.
  1115. #Skorepa et al. – on bark.
  1116. #E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
  1117. Pseudosagedia cestrensis R.C. Harris
  1118. #Lendemer & Knapp -
  1119. Pseudosagedia raphidosperma R.C. Harris
  1120. #Lendemer & Knapp -
  1121. Psora decipiens Hoffm.
  1122. #Syn.: Lecidea decipiens Ach.
  1123. #Skorepa et al. – on soil.
  1124. Psora russellii A. Schneider
  1125. #Syn.: Lecidea russellii Tuck.
  1126. #Skorepa et al. – Frederick Co., on conglomerate boulders.
  1127. #Skorepa et al. – on calcareous rock.
  1128. Psorotichia schaereri Arnold
  1129. #Skorepa et al. – on cement.
  1130. Psorula rufonigra Gotth. Schneider
  1131. #Syn.: Lecidea rufonigra Nyl.
  1132. #Skorepa et al. – Lichens of Soldiers Delight.
  1133. #Skorepa et al. – on acidic rock.
  1134. Punctelia appalachensis Krog
  1135. #Syn.: Parmelia appalachensis Culb.
  1136. #Skorepa et al. – on bark.
  1137. Punctelia bolliana Krog
  1138. #Syn.: Parmelia bolliana Müll. Arg.
  1139. #Skorepa et al. – on bark.
  1140. Punctelia borreri Krog
  1141. #Syn.: Parmelia borreri Turner
  1142. #Skorepa et al. – on bark.
  1143. Punctelia missouriensis G. Wilh. & Ladd
  1144. #Lendemer & Knapp -
  1145. Punctelia perreticulata G. Wilh. & Ladd
  1146. #Syns.: Punctelia subrudecta Krog, Parmelia subrudecta Nyl.
  1147. #Skorepa et al. – Lichens of Soldiers Delight.
  1148. #Skorepa et al. – on bark, acidic rock.
  1149. #Biechele – lower eastern shore of Maryland.
  1150. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Owings Mills, on bark.
  1151. #E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bark of Norway Maple.
  1152. #Lendemer & Knapp -
  1153. Punctelia rudecta Krog
  1154. #Syn.: Parmelia rudecta Ach.
  1155. #Skorepa et al. – Caroline Co., on trunks of trees.
  1156. #Skorepa et al. – on bark, acidic rock.
  1157. #Biechele – lower eastern shore of Maryland.
  1158. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Ivy Mill Road, on bark; Calvert Co.; Wicomico Co.; Carroll Co., on bark of Tulip Tree.
  1159. #E.C. Uebel Herbarium – Prince George's Co., on dead limb; Carroll Co., Liberty Reservoir, on bark.
  1160. #Lendemer & Knapp -,,
  1161. Pycnothelia papillaria Dufour
  1162. #Skorepa et al. – Prince George's Co., along dirt road.
  1163. #Skorepa et al. – on soil.
  1164. #Biechele – lower eastern shore of Maryland.
  1165. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  1166. Pyrenula pseudobufonia R.C. Harris
  1167. #Syn.: Pyrenula neglecta R.C. Harris
  1168. #Skorepa et al. – on bark.
  1169. #Lendemer & Knapp -,
  1170. Pyrenula punctella Trevis.
  1171. #Lendemer & Knapp -,
  1172. Pyrenula subelliptica R.C. Harris
  1173. #Syn.: Pyrenula imperfecta R.C. Harris
  1174. #Skorepa et al. – on bark.
  1175. Pyrrhospora varians R.C. Harris
  1176. #Syn.: Lecidea varians Ach.
  1177. #Skorepa et al. – Worcester Co., on twigs of Myrica.
  1178. #Skorepa et al. – on bark.
  1179. #Lendemer & Knapp -,,
  1180. Pyxine caesiopruinosa Imshaug
  1181. #Skorepa et al. – Howard Co., on tree.
  1182. #Skorepa et al. – on bark.
  1183. #E.G. Worthley Herbarium - Baltimore Co., on bark of Juglans nigra; Carroll Co., on bark of Juglans nigra.
  1184. Pyxine sorediata Mont.
  1185. #Skorepa et al. – Garrett Co., on oak.
  1186. #Skorepa et al. – on bark.
  1187. #Biechele – lower eastern shore of Maryland.
  1188. #E.G. Worthley Herbarium – Frederick Co.; Baltimore Co., growing on a sterile crust, Pertusaria?
  1189. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on tree root; Ridge Road, on bark Norway Maple.
  1190. #Lendemer & Knapp -,,
  1191. Pyxine subcinerea Stirton
  1192. #E.C. Uebel Herbarium – Prince George's Co., on oak bark; Baltimore Co., on maple bark.
  1193. Ramalina americana? Hale
  1194. #Biechele – lower eastern shore of Maryland.
  1195. Ramalina fastigiata Ach.
  1196. #Skorepa et al. – Worcester Co., on branches of deciduous trees.
  1197. #Skorepa et al. – on bark.
  1198. Ramalina willeyi R. Howe
  1199. #Skorepa et al. – Worcester Co., on branches of deciduous trees.
  1200. #Biechele – lower eastern shore of Maryland.
  1201. Ramonia microspora Vězda
  1202. #Lendemer & Knapp -
  1203. Rhizocarpon concentricum Beltr.
  1204. #E.G. Worthley Herbarium - Garrett Co., Swallow Falls State Forest, on sandstone.
  1205. Rhizocarpon eupetraeum Arnold
  1206. #Syn.: Rhizocarpon intermedium Degel.
  1207. #Skorepa et al. – on acidic rock.
  1208. Rhizocarpon geographicum DC.
  1209. #Skorepa et al. – on acidic rock.
  1210. Rhizocarpon obscuratum A. Massal.
  1211. #Skorepa et al. – Baltimore Co., on rock outcrop.
  1212. #Skorepa et al. – on acidic rock.
  1213. Rhizoplaca chrysoleuca Zopf
  1214. #Syn.: Lecanora rubina Ach.; Lecanora chrysoleuca Ach.
  1215. #Skorepa et al. – Montgomery Co., on rock ledges.
  1216. #Skorepa et al. – on acidic rock.
  1217. #E.G. Worthley Herbarium - Frederick Co., Mt. Catoctin Park; Montgomery Co., Great Falls, on rocks.
  1218. Rimelia subisidiosa Hale & Fletcher
  1219. #Syn.: Parmelia subisidiosa C.W. Dodge
  1220. #Skorepa et al. – on bark.
  1221. Rinodina applanata H. Magn.
  1222. #Skorepa et al. – on bark.
  1223. Rinodina ascociscana Tuck.
  1224. #Skorepa et al. – on bark.
  1225. Rinodina exigua Gray
  1226. #Skorepa et al. – on bark.
  1227. Rinodina ochrocea Willey ex Fink
  1228. #Skorepa et al. – on acidic rock.
  1229. Rinodina oxydata A. Massal.
  1230. #Skorepa et al. – on acidic rock.
  1231. Rinodina papillata H. Magn.
  1232. #Skorepa et al. – on bark.
  1233. Rinodina subminutaH. Magn.
  1234. #Skorepa et al. – on bark.
  1235. Sarcogyne clavus Kremp.
  1236. #Skorepa et al. – on acidic rock.
  1237. Sarcogyne regularis Körber
  1238. #Skorepa et al. – on calcareous rock.
  1239. #E.C. Uebel Herbarium – Prince George's Co., Greenbelt, on hill of concrete.
  1240. Sarcosagium campestre Poetsch & Schiedem.
  1241. #Syn.: Biatorella campestris Almq.
  1242. #Skorepa et al. – on soil.
  1243. Schismatomma glaucescens R.C. Harris
  1244. #Lendemer & Knapp -
  1245. Scoliciosporum chlorococcum Vezda
  1246. #Syn.: Bacidia chlorococca Lett.
  1247. #Skorepa et al. – Montgomery Co., on oak.
  1248. #Skorepa et al. – on bark.
  1249. #E.G. Worthley Herbarium - Worcester Co., Milburn Landing.
  1250. #E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of Acer rubrum.
  1251. #Lendemer & Knapp -
  1252. Scoliciosporum umbrinum Arnold
  1253. #Syn.: Bacidia umbrina Bausch
  1254. #Skorepa et al. – Garrett Co., on aspens.
  1255. #Skorepa et al. – on acid rock.
  1256. Sphinctrina turbinata de Not.
  1257. #E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on Aspicilia caesiocinerea.
  1258. Sticta fuliginosa Ach.
  1259. #E.G. Worthley Herbarium - Frederick Co., along Appalachian Trail, on soil.
  1260. Teloschistes chrysophthalmus Th. Fr.
  1261. #Skorepa et al. – on bark.
  1262. Tephromela atra Hafellner
  1263. #Lendemer & Knapp -
  1264. Thelidium minutulum Körber
  1265. #Lendemer & Knapp -
  1266. Thelotrema monospermum R.C. Harris
  1267. #Lendemer & Knapp -
  1268. Thelotrema subtile Tuck.
  1269. #Lendemer & Knapp -,
  1270. Trapelia coarctata M. Choisy
  1271. #Syn.: Lecidea coarctata Nyl.
  1272. #Skorepa et al. – on acidic rock.
  1273. Trapeliopsis flexuosa Coppins & P. James
  1274. #Syn.: Lecidea aeruginosa Borrer
  1275. #Skorepa et al. – Harford Co., on fence post.
  1276. #Skorepa et al. – on wood.
  1277. #E.C. Uebel Herbarium – Prince George's Co., NE Branch of Anacostia River Bike Trail, on weathered fence rail.
  1278. #Lendemer & Knapp -,
  1279. Trapeliopsis granulosa Lumbsch
  1280. #Syn.: Lecidea granulosa Ach.
  1281. #Skorepa et al. – on soil.
  1282. #E.G. Worthley Herbarium - Montgomery Co., Great Falls, on timber.
  1283. Trypethelium virens Tuck. ex Michener
  1284. #Skorepa et al. – on bark.
  1285. #E.G. Worthley Herbarium - Calvert Co., on bark.
  1286. #Lendemer & Knapp -,
  1287. Tuckermanella fendleri Essl.
  1288. #Syn.: Cetraria fendleri Tuck.; Tuckermannopsis fendleri Hale
  1289. #Skorepa et al. – Lichens of Soldiers Delight.
  1290. #Skorepa et al. – on bark.
  1291. #Biechele – lower eastern shore of Maryland.
  1292. #E.G. Worthley Herbarium - Wicomico Co., Wicomico State Park; on Loblolly Pine; Worcester Co., Milburn Landing, on bark of Loblolly Pines.
  1293. Tuckermannopsis americana Hale
  1294. #Lendemer & Knapp -
  1295. Tuckermannopsis ciliaris Gyelnik
  1296. #Syn.: Cetraria ciliaris Ach.
  1297. #Skorepa et al. – Lichens of Soldiers Delight.
  1298. #Skorepa et al. – on bark.
  1299. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Wicomico Co., on bark.
  1300. Umbilicaria mammulata Tuck.
  1301. #Syn.: Gyrophora dillenii Müll.
  1302. #Skorepa et al. – Garrett Co., on conglomerate.
  1303. #Skorepa et al. – on bark, acidic rock.
  1304. #E.G. Worthley Herbarium - Baltimore Co., Loch Raven, on rock outcrop; Frederick Co., South Mt., on boulders; Montgomery Co., Sugarloaf Mt., on boulders.
  1305. Umbilicaria muehlenbergii Tuck.
  1306. #Skorepa et al. – Allegany Co., on rock outcrop.
  1307. #Skorepa et al. – on acidic rock.
  1308. Umbilicaria vellea Hoffm.
  1309. #Skorepa et al. – No locality.
  1310. #Skorepa et al. – on acidic rock.
  1311. Usnea filipendula Stirton
  1312. #Syn.: Usnea dasypoga Rohl.
  1313. #Skorepa et al. – Garrett Co.,.
  1314. #Skorepa et al. – on bark.
  1315. Usnea mutabilis Stirton
  1316. #Skorepa et al. – Worcester Co., on pines.
  1317. #Skorepa et al. – on bark.
  1318. #Biechele – lower eastern shore of Maryland.
  1319. #E.G. Worthley Herbarium - Worcester Co., Pocomoke State Park, on Taxodium distichum.
  1320. Usnea pensylvanica Motyka
  1321. #Lendemer & Knapp -,
  1322. Usnea strigosa Eaton
  1323. #Skorepa et al. – Worcester Co., on deciduous trees.
  1324. #Biechele – lower eastern shore of Maryland.
  1325. #E.G. Worthley Herbarium – Worcester Co.; Calvert Co, Battle Creek Cypress Swamp; St. Mary's Co.; Wicomico Co.
  1326. #E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
  1327. #Lendemer & Knapp -
  1328. Usnea strigosa subsp. rubiginea I. Tav.
  1329. #Syn.: Usnea rubiginea Massal.
  1330. #Skorepa et al. – Worcester Co., on deciduous trees.
  1331. #Skorepa et al. – on bark.
  1332. Usnea subscabrosa Nyl. ex Motyka
  1333. #Lendemer & Knapp -,,,
  1334. Usnea trichodea Ach.
  1335. #Skorepa et al. – Worcester Co., on tops of Cypress trees.
  1336. #Skorepa et al. – on bark.
  1337. #Biechele – lower eastern shore of Maryland.
  1338. #Lendemer & Knapp -
  1339. Verrucaria calciseda DC.
  1340. #Skorepa et al. – on calcareous rock.
  1341. Verrucaria fuscella Winch
  1342. #Skorepa et al. – on calcareous rock.
  1343. Verrucaria glaucovirens Grummann
  1344. #Syn.: Verrucaria virens Nyl.
  1345. #Skorepa et al. – on calcareous rock.
  1346. Verrucaria muralis Ach.
  1347. #Skorepa et al. – on calcareous rock.
  1348. Verrucaria nigrescens Pers.
  1349. #Skorepa et al. – Lichens of Soldiers Delight.
  1350. #Skorepa et al. – on calcareous rock.
  1351. Verrucaria pinguicula A. Massal.
  1352. #Skorepa et al. – on calcareous rock.
  1353. Xanthomendoza fallax Søchting, Kärnefelt & S. Kondr.
  1354. #Syn.: Xanthoria fallax Arn.
  1355. #Skorepa et al. – Worcester Co., on deciduous trees.
  1356. #Skorepa et al. – on bark, cement.
  1357. #Biechele – lower eastern shore of Maryland.
  1358. Xanthomendoza fulva Søchting, Kärnefelt & S. Kondr.
  1359. #Syn.: Xanthoria fulva Poelt & Petutschnig
  1360. #E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
  1361. Xanthoparmelia angustiphylla Hale
  1362. #Syn.: Parmelia hypopsila Müll. Arg. = Xanthoparmelia hypopsila, but N.A. records are Xanthoparmelia angustiphylla.
  1363. #Skorepa et al. – Baltimore Co., on rock outcrop.
  1364. #Skorepa et al. – on acidic rock.
  1365. Xanthoparmelia conspersa Hale
  1366. #Syn.: Parmelia conspersa Ach.
  1367. #Skorepa et al. – Garrett Co., on rock outcrop.
  1368. #Skorepa et al. – on acidic rock.
  1369. #E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Gunpowder River, on rock outcrops; Frederick Co.
  1370. Xanthoparmelia cumberlandia Hale
  1371. #Syn.: Parmelia cumberlandia Hale
  1372. #Skorepa et al. – Baltimore Co., on rocks on hillside.
  1373. #Skorepa et al. – on acidic rock.
  1374. Xanthoparmelia plittii Hale
  1375. #Syn.: Parmelia plittii Gyelnik
  1376. #Skorepa et al. – Washington Co., on rock outcrops.
  1377. #Skorepa et al. – on acidic rock.
  1378. #E.C. Uebel Herbarium – Lichens of Soldiers Delight.
  1379. Xanthoparmelia subramigera Hale
  1380. #E.C. Uebel Herbarium – Prince George's Co., Berwyn Heights, on roof shingles.
  1381. Xanthoparmelia tasmanica Hale
  1382. #Syn.: Parmelia tasmanica Hook. f. & Taylor
  1383. #Skorepa et al. – on acidic rock.
  1384. Xanthoparmelia viriduloumbrina Lendemer
  1385. #Syn: Parmelia taractica Kremplh. = Xanthoparmelia taractica Hale – known from Mexico, but misidentifications for our area; specimens in eastern N.A. are X. viriduloumbrina.
  1386. #Skorepa et al. – Baltimore Co., on serpentine rocks.
  1387. #Skorepa et al. – on acidic rock.
  1388. #E.G. Worthley Herbarium ; Allegany Co., Green Ridge State Forest, on red shale; Carroll Co., Church of the Brethren, on stone wall.
  1389. Xanthoria parietina? Th. Fr.
  1390. #Biechele – lower eastern shore of Maryland.