Gymnographopsis

Gymnographopsis is a genus of lichen-forming fungi in the family Graphidaceae. It was circumscribed by American lichenologist Carroll William Dodge in 1967, with Gymnographopsis chilena assigned as the type species. These lichens form dull grey-olive to yellow-brown crusts on tree bark and are characterized by straight to weakly curved fruiting bodies whose sides appear brown-black and whose openings expose disc-like surfaces. The genus has a pantropical distribution, growing on shaded tree trunks and lower branches in evergreen forests, where their intolerance of heavy disturbance makes them useful indicators of long-standing, moist woodland habitats....read more on Wikipedia.