Species: Xanthoparmelia mougeotii
Photos: On acidic upland rock. Ballingeary, Cork, SW Ireland.
Thallus of narrow, radiating, +/- flat yellowish-grey lobes, closely adpressed. Black lower surface with short, simple rhizines. Centre becomes darker grey-yellow and covered with scattered pale grey soralia. Apothecia rare, discs brown, margins often sorediate.
Occurs on well-lit siliceous rocks, tombstones, gravel and quartz chippings.
Medulla K+ yellow-orange, C-, KC+ orange, P+ orange, UV-
Similar: Arctoparmelia incurva.
Medulla K-, C-, KC+ pink, P+ rust-red, UV+ blue-white
Xanthoparmelia mougeotii. February and August 2009