Order: Teloschistales       Family: Teloschistaceae Species: Calogaya oblitterata (Caloplaca arnoldii) Growth type crustose. Photos: On rock. Killarney NP, Co. Kerry, SW Ireland. Identified by John Douglass Thallus is crustose in the centre with minute lobes at the margins, the tips adpressed. Initially yellow-orange, becoming deep reddish-orange. Apothecia have orange-red discs, 0.2-0.5mm in diameter with well developed orange margins. Asci 8-spored, the septum wide, about or more than 1/3 of ascospore length, 8-14 x 4-7 µm. K+ red-purple. Widespread but scarce on well-lit siliceous rocks, usually coastal.

Calogaya oblitterata (Caloplaca arnoldii). November 2010