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This is a species of shaded, siliceous rock outcrops and dry stone walls in well-wooded hilly country. It has a scurfy, grey-green thallus and small black convex discs sometimes united to form lumpy aggregations. The spores are simple. A reddish-brown hypothecium forms a distinctive layer in the disc below an olivaceous ‘upper disc’ layer or epithecium. In Ireland, the species is rare.
Original text submitted by Vince J. Giavarini