Crumpled Rock Tarpaper Lichen

Lathagrium fuscovirens, the crumpled rock jelly, is a species of lichen-forming fungus in the family Collemataceae. It forms dark olive-green to blackish, leaf-like growths up to 5 cm across that have a jelly-like texture when wet. Small bead-like propagules called isidia are often abundant on its surface. The species grows on hard limestone and similar calcareous rock, and is found across much of Europe, parts of North America including eastern Canada and the western and eastern United...