Thelotrema lepadium (Ach.) Ach. ?

British Columbia: Vancouver, ubc endowment lands (nt): shady alnus rubra-acer macrophyllum woodland with thick understory; air circulation good.
49 15'N, 123 15'W
Corticolous acer macrophyllum trunk.

Trevor Goward s.n., june 15, 1981
UBC