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(Map updated: 11 August 2009)

On siliceous rock in sheltered gullies — often by woodland — this lichen has a thallus of film-like granules which gives the impression it is somewhat stunted. However, the black discs (0.4-0.7mm diam.) are frequent, especially in crevices in the acid rock. Attention should be given to the persistent and wavy disc rim (exciple) which in section is entirely brown. Spot tests unhelpful. In Ireland, the species is known from Counties Kerry, Mayo and Donegal.

Key characteristics

• Poorly developed thallus of granules; discs black, exciple persistent, brown in section
• On sheltered acid rock in wooded gullies.

Original text submitted by Vince J. Giavarini