Description: A distinctive crustose lichen with a thick, pale grey, warted thallus. Conspicuous large black apothecia with pale margins are abundant. This is a common species of the 'Grey Zone' but also is found on siliceous rocks inland. Superficially similar to Lecidella subincongrua, but that species has a pale ochre thallus and the convex apothecia have black margins.

Key Identification Features:

• Thick, warted, pale-grey thallus.
• Conspicuous black apothecia with pale margins.

Original text submitted by Michael J. Simms

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

iNaturalist: Tephromela atra at iNaturalist World Species Observations database.