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(Map updated: 11 August 2009)

This small crustose lichen grows mostly on calcareous surfaces and mortar. Both the thallus and the tightly aggregated red-brown to black discs are densely frosted with white pruina. Spot tests negative. The spores are one-septate. The species is local in Ireland.

Key characteristics

• Brown to black densely frosted discs; not unlike Lecanora crenulata in size
• Spores one-septate; on calcareous walls and rock.

Original text submitted by Vince J. Giavarini