Micareaceae Psilolechia lucida Growth type crustose Chemical reactions negative, UV+ orange Common and widespread on dry, shaded rocks, walls, bricks, stonework and headstones in rural and urban areas. Powdery thallus of bright yellow-green, very fine, leprose granules that can form large patches. The small yellowish apothecia are rare and often +/- hidden in the thallus. Asci 8-spored, spores 4-7 x 1-2 µm. Sometimes host to Microcalicium arenarium Similar: Psilolechia leprosa, pale green or whitish-grey, apothecia frequent

Psilolechia lucida
St. Aldhelm's, Lytchett heath, Dorset. February 2014