Thallus usually thick, warted, cracked or areolate, light grey, often with bluish tinge. Prothallus grey when present. Apothecia have black discs with persistent, thin, entire margins.
Found on nutrient-rich siliceous rocks, often near water.
All year round.
Widespread and common in Britain.
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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