Arthonia varians is a parasitic lichen of Lecanora rupicola taking over and blackening the apothecia of that species and retarding their development.
Where its host Lecanora rupicola is present.
All year round.
Widespread and evidently common where the host occurs, but evidently under-recorded.
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