Lithothelium echinatum
Lithothelium echinatum is a species of saxicolous (rock-dwelling) lichen in the family Pyrenulaceae. Found in China, it was formally described as a new species in 2006 by Dutch lichenologist André Aptroot. The type specimen was collected by the author in Green Stone Park (Xishuangbanna, Yunnan) at an altitude of ; here, the pale green, thin crust was found growing on limestone. "Lithothelium echinatum" is the only species in genus "Lithothelium" that has echinate ascospores (i.e., with pointed spines).