Description: 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 Identification Features:

• 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

Distribution Map from NBN: Lecania turicensis at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Lecania turicensis at iNaturalist World Species Observations database.