New name: Myriolecis albescens
A distinctive crustose species with a thick, pure white, cracked to areolate thallus that can be almost placodioid. The apothecia are innate and crowded, with pinkish buff to greenish discs that are frequently heavily white-pruinose.
Thallus: C-, K-, UV-
Lecanora albescens is found in mainly coastal and eastern areas of Scotland where it prefers sunny, calcareous saxicolous substrata, including mortared church walls. BLS distribution map
On mortared church walls, Lecanora albescens often grows alongside Caloplaca holocarpa and Lecanora dispersa.
Lecanora albescens is distinguished from Lecanora dispersa on basis of the apothecia being set in a thick white thallus.
scottishlichens.co.uk 