Monerolechia bayrhofferi

About

Monerolechia is a genus of lichen-forming fungi in the family Caliciaceae. These lichens form crusty patches that break into small blocks or flakes, typically coloured chocolate to grey-brown, and produce black fruiting bodies for reproduction. Most species in this genus start life as parasites on other lichens before developing their own independent growth, which helps distinguish them from similar-looking lichen groups.

Summary from Wikipedia