Grey or creamy-grey patches of thallus surrounded by a black prothallus. Round or irregular soralia with greyish-white or greyish, farinose or granular soredia. Apothecia rare.
Found on siliceous rocks and pebbles, brick walls and gravestones.
All year round.
Widespread and fairly frequent in Britain.
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015