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This is one of the smaller species of this genus. It grows in a range of habitats: fragments of limestone, pieces of brick, on or about neglected or overgrown ground and sometimes abundantly on stones in shady woodlands, often by streams. The small thin, fingernail-sized thallus is usually accompanied by rather conspicuous spherical discs (perithecia) with average-sized spores (18–24µm long). Throughout Ireland.
Original text submitted by Vince J. Giavarini