Species: Lecanora muralis
Photos: On rock beside lake. Gougane Barra, Cork, SW Ireland.
Pale greenish-grey to yellow-grey lobular thallus with clearly lobed outer margin. Numerous apothecia with brown or creamy-brown discs, margins crenulate when mature.
Common in urban areas on roof-tiles, concrete, asphalt, pavements. Also found on nutrient-rich bird-perching rocks.
K-, C-, P- or P+ yellowish
Lecanora muralis. Gougane Barra, Co.Cork. December 2008