Species: Hypotrachyna laevigata
Photos: On rock and tree trunk. Co. Cork, SW Ireland.
Light bluish-grey or grey-green thallus, fairly narrow lobes with curved axils and overlapping square-cut tips. Black under-surface with dichotomously branched rhizines reaching edges. Medulla white. Lobe-tips sorediate, apothecia are rare, discs dark brown, exciple +/- sorediate, initially entire but becoming torn.
Found on acidic trees and rocks, sometimes over-growing mosses.
Medulla and soredia K-, C+ orange, KC+ orange
Similar: Hypotrachyna endochlora and Hypotrachyna sinuosa
Hypotrachyna laevigata March and November 2009. Fertile specimen April 2010