Platythecium

About

Platythecium is a genus of lichen-forming fungi in the family Graphidaceae. It comprises 25 species. Described in 2002 by the German lichenologist Bettina Staiger, these bark-dwelling lichens are found in humid, shaded forests across tropical and warm temperate regions worldwide. They are characterized by their flattened, plate-like fruiting structures with completely blackened walls and are sensitive to forest disturbance, making their presence an indicator of long-established woodland conditions.

Summary from Wikipedia