Description: This is a species of rock overhangs in old established woodlands, for example, Killarney, where sheltered openings in the cliff face are good sites to search for it. Here it may form thick, spreading yellow-brown patches or discrete rosettes, against a brown or purple-black prothallus. Older thalli quickly become sorediate at the centre. All spot tests negative. In Ireland, it is currently known only from County Kerry,

Key Identification Features:

• Thallus: thick, ochre-brown, forming spreading patches below sheltered overhangs in ancient woodland; soredia is common only on the older parts of the thallus
• Spot tests negative; discs rare.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Schismatomma umbrinum at iNaturalist World Species Observations database.