Rock Hairball Lichen

Spilonema revertens, the rock hairball lichen, is a species of fruticose lichen in the family Coccocarpiaceae. This dark-coloured cyanolichen forms small, dense cushions on rocks across the Northern Hemisphere. Found in Europe, Asia, North America, Macaronesia, and Greenland, it typically grows on exposed rocks that experience alternating wet and dry periods. The species is most commonly found in lower mountain zones, particularly in open coniferous forests and rocky steppes, though it also occurs in coastal areas....