Caloplaca ulleungensis
Caloplaca ulleungensis is a species of saxicolous, crustose lichen in the family Teloschistaceae. It is found in South Korea, particularly on Ulleungdo and Jeju Islands.
Taxonomy
The lichen was first formally described in 2020 by the lichenologists Sergey Kondratyuk, László Lőkös, and Jae-Seoun Hur. The type specimen was collected by the first two authors from Jeodong-ri at an elevation of, where it was found growing on a rock wall. The species is named after its type locality, Ulleungdo Island in the Republic of Korea.Description
The thallus of Caloplaca ulleungensis is crustose, overgrowing rock surfaces and sometimes bryophyte thalli and plant remnants. It appears dull yellowish, greyish, or whitish-grey and is often cracked into very small portions, creating a rough granulated surface texture. The thallus lacks vegetative propagules and has a black prothallus line along its edge.Apothecia are 0.2–1.1 mm in diameter and up to 0.35 mm thick. They have a dark brown with a dull yellow or yellow-orange margin, resembling the types found in Brigantiaea or Letrouitia. The apothecia are, with the being and the hymenium reaching 100–180 μm in height. The ascospores are with attenuated ends, often becoming yellowish, orange, or brownish, and vary in size and septum width.
Pycnidia are immersed in the thallus, with conidia measuring approximately 2.6–3.0 by 1.0–1.1 μm.