Description: This attractive, non-yellow Caloplaca usually grows low to the ground. It is found on siliceous rocks, especially the kerbing around graves, but it can also grow on damp limestone, for example, tomb tops, and on basic bark. The granular (isidiate), cracked, blue-grey thallus may be covered with discs (to 1mm diam.), yellow-orange, with a persistent, thick wavy margin the colour of the thallus. Spot tests: disc K+ violet-red. Northern half of Ireland.

Key Identification Features:

• Non-yellow Caloplaca, blue-grey, dense with granular isidia, discs yellow-orange
• Low, acid-rock kerbing in old churchyards and damp limestone tomb tops; disc K+ red.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Caloplaca chlorina at iNaturalist World Species Observations database.