Description: This is a rare lichen of hard siliceous rocks. Growth begins initially on the thallus of Schaereria fuscocinerea until becoming independently established. The grey-cracked thallus is C+ red. This reaction separates it from lookalikes such as B. aethelea. Very rare in Ireland: County Donegal.

Key Identification Features:

• Grey-cracked thallus to 5cm diam. surrounded by a black prothallus; initially parasitic on Schaereria fuscocinerea
• Thallus C+ red; on hard siliceous rocks.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Buellia uberior at iNaturalist World Species Observations database.