Parmelia submutata

Parmelia submutata is a species of corticolous (bark-dwelling) foliose lichen in the family Parmeliaceae. Described from Yunnan, China in 1899, this lichen has since been found across high-elevation regions of Asia, including Taiwan and Nepal, where it grows on tree bark in pine–Rhododendron forests at high elevations. The species forms greenish-grey growths typically 8–12 cm across and is characterized by its shiny surface that becomes finely cracked with age, numerous small pale pores, and densely branched root-like structures on the black undersurface—features that help distinguish it from the closely related Parmelia meiophora....read more on Wikipedia.