A white or grey white crustose lichen with crowded apothecia which have thick margins and pale buff discs.
On sunny faces of calcareous rocks and concrete.
All year round
This species is often parasitised by another lichen, Arthonia apotheciorum, which blackens the apothecia discs.
Common in England, more local in Wales and Scotland.
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