A crustose species with a yellow-green thallus that often consists of scattered granules or areoles, and may have a dark prothallus. The areoles have a flat, smooth surface, but are frequently obscured by the apothecia. The apothecia are pale yellow to yellow-green. Mature apothecia become convex and often exclude the paler margin.
Thallus: C-, K+ faint yellow, UV-
Lecanora polytropa is common throughout Scotland where it is found in less polluted areas on siliceous rocks, including gravestones. BLS distribution map
scottishlichens.co.uk 