Order: Teloschistales Family: Teloschistaceae
Species: Caloplaca variabilis
Photos: On concrete. Aughinish, Co. Limerick, W Ireland.
Identification needs confirming
Grey to greyish-brown, areolate, rounded thallus, sometimes with a dark prothallus. Sessile apothecia with grey-blue pruinose black discs. The epithicium is pale, K+ purple. Thallus K-.
Spores 14-16 x 7-9 Ám, the septum 2-3 Ám wide.
Found on nutrient-rich calcareous rocks, walls and the horizontal copings of walls and bridges.
Caloplaca variabilis. December 2009