Growth type placodioid (crustose with lobed margins)
Chemical results: K+ crimson / purple
Very common on hard calcareous rocks, walls, headstones and memorials.
Host to Intralichen christiansenii, Weddellomyces epicallopisma
Thallus is +/- circular or arc-shaped with narrow yellow-orange lobes and a whitish centre which often disintegrates with age. Numerous orange apothecia with paler margins. Soredia and isidia are absent. Ascospores are polarilocular and swollen at the septum, 12-15 x 8-10 Ám.
Similar: Caloplaca aurantia and Caloplaca saxicola
Wareham churchyard, Dorset. August 2012