A crustose grey or grey-brown lichen the convex black apothecia becoming reddish when wet. Apothecia never pruinose.

Can be easily confused with Lecidella stigmatea

Please provide close-up photographs to support your record.  Expert confirmation of identification may be needed.

Widespread on calcareous rocks, mortared walls, asbestos and cement.

All year round.

Common and widespread throughout Britain.

Fairly frequent in Leicestershire and Rutland.