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(Map updated: 11 August 2009)

This orange-fruited, lichen epiphyte occurs mainly on the twigs and branches of basic-barked trees and shrubs. The relatively large (to 2mm diam.), yellow-orange discs bordered by a thick, grey, wavy margin is diagnostic. It is scattered throughout Ireland.

Key characteristics

• The faint grey, crustose thallus, and rather large fruits with a thick, grey margin serve to separate it from other Caloplaca species growing on bark
• Trees such as ash and sycamore are especially favoured.

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

iNaturalist: Species account : iNaturalist World Species Observations database

Original text submitted by Simon Davey