Click on map to open large map in new window
(Map updated: 11 August 2009)

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.

Key characteristics

• Thallus thin, green to brown, forming tiny patches usually on small stones; perithecia large 0.12–0.8mm diam.
• On various substrata, especially small stones in woodland.

Original text submitted by Vince J. Giavarini