Gloeoheppia

Gloeoheppia is a genus of lichen-forming fungi in the family Lichinaceae. It comprises five species. Members of the genus form small, scaly to slightly shield-shaped patches that are usually dark brown, olive, or blackish, and many become more swollen when wet. They mostly live in warm, dry regions on calcareous soil or rock, where they often form part of biological soil crusts that help bind and stabilise bare ground. Gloeoheppia is distinguished from similar-looking lichens like Heppia by its internal structure, the nature of its photobiont, and details of its reproductive structures....read more on Wikipedia.