A crustose species with a thin and granular or areolate thallus that is pale yellowish green or grey and forms neat patches with no, or only a diffuse, prothallus. There are no soralia and the margins of the apothecia become excluded very early on. The apothecia have yellowish discs that become convex and darker with age.
Thallus: C+- orange, K-, UV+ dull orange
In Scotland, Lecanora symmicta is widespread on acid-barked trees, rotting and decorticate wood, including old fences. BLS distribution map
Lecanora symmicta is distinguished from Lecanora confusa on basis of the thalline margin that becomes excluded early on.
scottishlichens.co.uk 