Description: 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 Identification Features:

• 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

Distribution Map from NBN: Verrucaria murina at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Verrucaria murina at iNaturalist World Species Observations database.