Description: A much sought-after species. Known only from a single site in County Clare, P. mammilosa is a soil-inhabiting Porina. The rather thick, uneven thallus produces perithecial discs (0.3–0.5mm diam.) with pink, orange and yellow internal pigments, which burst through the surface taking a layer of grey thallus with them. Spores are three-septate, narrower than in P. sudetica.

Key Identification Features:

• Soil-inhabiting; thallus thick, uneven
• Perithecia with bright pigmentation (in squash); spores three-septate.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Porina mammillosa at iNaturalist World Species Observations database.