Phacographa
Phacographa is a genus of lichenicolous fungi in the family Roccellaceae. It has three species.
Taxonomy
The genus was circumscribed in 2009 by the Austrian lichenologist Josef Hafellner, who assigned Phacographa glaucomaria as the type species. This species was originally described by William Nylander in 1852 as a member of the genus Lecidea. In addition to the type, another species was transferred from the genus Opegrapha, and a third species was described as new. The genus name, which combines the Greek phakos with grapho, alludes to its relationship with the genera Phacothecium and Opegrapha.Description
Species in Phacographa make fruiting bodies that are roundish and . One hymenium is made per ascoma, and they are exposed early in their development, resulting in bits of that crumbles off. The fungi produce an insoluble pigment, known variously as "pigment 1" or "", that is known to occur in several other species in the Arthoniales.Phacographa species make hyaline with three septa and rounded ends. A thin sheath initially covering the spore eventually results in a surface texture in maturity.