Lecanoraceae Lecanora albella Growth type crustose Thallus K+ yellow, C-. Apothecia C-, P+ yellow or red, UV+ pale orange Easily overlooked on twigs and bark of smooth-barked, slightly acidic deciduous trees (e.g Oak) Small patches of whitish or pale-grey, smooth or warted thallus, often with white prothallus. Discs usually densely white-pruinose, pinkish to pale brownish. Conspicuous margins becoming +/- crenulate or excluded. Similar: Lecanora carpinea. Thallus K+ yellow. Apothecia C+ yellow Lecanora confusa. Thallus usually K-, C+ orange, UV+ bright orange

Lecanora albella
Dorset. April 2014, March 2019