Tylophoron hibernicum

Tylophoron hibernicum is a species of crustose lichen in the family Arthoniaceae. The species forms a thin, pale greyish-white crust dotted with small, rounded sporodochia that produce asexual spores. Originally described in 1979 as Blarneya hibernica based on Irish specimens, it was transferred to Tylophoron in 2011 following molecular and morphological studies that demonstrated Blarneya was nested within that genus. This bark-dwelling lichen grows on trees in humid forests and has a scattered pantropical to warm-temperate distribution, with confirmed records from Ireland, the Pyrenees, the Galápagos Islands, Hawaii, and tropical Africa. In North America, the species was long reported as Tylophoron protrudens, but re-examination of the type material of T. protrudens supported restricting that name to material without sporodochia; as a result, North American reports under that name are referable to T. hibernicum....read more on Wikipedia.