Order: Lecanorales Family: Lecanoraceae
Species: Lecanora expallens
Photos: On old fence post. Ballingeary, Cork, SW Ireland.
Cracked or granular yellow-green to yellow-grey thallus. Pale yellow, farinose soredia spreads to cover thallus. Small apothecia are infrequent, discs slightly pinkish, the sorediate margins becoming excluded. Pale grey prothallus visible on smooth bark.
K+ yellow, C+ deep yellow or orange-red, P-, UV+ orange
Common on tree trunks, bark, fences and worked timber.
Similar: Lecanora barkmaniana, K+ yellow, C-
Lecanora compallens, thallus K-, C-
Lecanora expallens. August 2009