Species: Flavoparmelia caperata
Photos: On tree trunks in car park. Macroom, Cork, SW Ireland.
Bluish-grey to apple-green thallus with tranversely wrinkled lobes expanding at apices. The under surfaces are black with light-brown margins and simple rhizines. Coarse granular soredia spreading over lobes, apothecia are occasional with sorediate margins.
Medulla and soredia: K+/- dirty yellow, C-, KC+ red, P+ orange-red. Host to the lichenicolous fungus Abrothallus microspermus
Common on well-lit acid-barked deciduous trees. Also found on fences, roofs, headstones and siliceous rocks.
Similar: Flavoparmelia soredians K+ yellow slowly turning red.