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(Map updated: 11 August 2009)

Most Caloplaca taxa are distinguished by a bright orange, crustose thallus. C. cirrochroa is no exception and on close study turns out to be one of the most beautiful examples of the family, forming circular thalli (1-2cm diam.) of narrow, radiating lobes to the rear of which are scattered, bright orange or lemon-yellow spots of convex soralia. The species is local, sometimes locally abundant, on hard, dry, sheltered, vertical limestone — undisturbed headstones especially. Throughout Ireland.

Key characteristics

• Orange circular thalli with an outer ring of radiating lobes surrounding an inner area spotted with bright orange or pale, lemon-yellow soredia
• On hard limestones in warm, sheltered localities.

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