A distinctive, leprose species with a yellow-white, thick, finely granular thallus that forms roughly circular patches. The pale margins are often distinctly lobed and raised.
Thallus: C+ yellow, K+ yellow to orange
Lepraria membranacea widespread in upland Scotland where it seeks out dry, shaded, acid rocks that are vertically aligned. BLS distribution map
scottishlichens.co.uk 