Physconia muscigena

Physconia muscigena is a species of lichen in the family Physciaceae. It exhibits a foliose growth form with that are generally ascending and concave at the tips. The upper cortex is grey-brown to brown in color and often mostly to completely (or covered in calcium oxalate crystals known as pruina).

Ecology and distribution
Physconia muscigena is often found growing mosses, small plants (such as Selaginella), or detritus atop of soil or rock. Its distribution is cosmopolitan, found on all continents including Antarctica.