Thallus variable in colour from whitish, through green and even brownish and having dark brown or black discs.
On urban walls and paths, cement, mortar. Also found on weakly calcareous or base-enriched siliceous rocks.
All year round
Widespread and common in Britain.
Common 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