Small thallus of greenish brown to black overlapping lobes, slightly swollen when moist. Lobe margins may be ascending, wavy, entire or crenate, never swollen.
On damp, calcareous substrates; walls, crumbling mortar, rocks.
All year round.
Most records seem to come from the southern half of Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015