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(Map updated: 11 August 2009)

This crustose epiphyte has a yellow-green thallus composed of minute isidia-like granules. Discs (to 1mm diam.) are common, orange-brown to almost red with pronounced margins. These are quick to attract the attention of the lichen hunter. It occurs on the basic bark of nutrient-rich trees, and is relatively frequent throughout Ireland.

Key characteristics

• The habitat, granular, yellow-green thallus and reddish-brown fruits are diagnostic
• It often occurs squeezed in between foliose species.

Original text submitted by Simon Davey