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(Map updated: 11 August 2009)

This lichen occurs as a sparse scattering of flake-like areoles (bits of thallus) over nutrient-rich acid rock, often following into the cracks and crevices. Discs numerous, concave, sometimes becoming crater-like or growing to obscure the areoles completely. Spot tests negative. Records are few, for example, one in County Kerry. Outside Ireland, it is recorded from pebbles in dunes and from roofing tiles.

Key characteristics

• Thallus of a few scattered areoles, black when dry; nutrient-enriched rock preferred
• Discs concave at first, growing to obscure the areoles and becoming gyrose.

NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database

iNaturalist: Species account : iNaturalist World Species Observations database

Original text submitted by Vince J. Giavarini