Species: Xanthoparmelia conspersa
Photos: On rock near lake. Gougane Barra, Cork, SW Ireland.
Thallus yellow-grey or bluish-grey, lobes adpressed, slightly broader at ends. Under surface black with short, simple rhizines. Isidia usually abundant, variable in form. Apothecia are occasional, discs red-brown, margins thin, crenulate, +/- isidiate.
Occurs on exposed siliceous rocks, roof tiles and walls in inland and coastal sites. Common and appears to be increasing.
Medulla: K+ yellow-orange, C-, KC+ orange-red, P+ orange, UV-
Xanthoparmelia conspersa. Gougane Barra, Co. Cork. February 2009