Opegrapha atra


Whitish or green-grey thallus, the short (1 mm), prominent lirellae with black looking central slit often densely crowded at centre of thallus.

Identification difficulty

Common on the trunks, branches and twigs of trees with smooth shaded bark, rarely found on fences. Forms extensive mosaics on young trees but tends to avoid nutrient-enriched bark.

When to see it

All year round.

UK Status

Widespread and fairly frequent in Britain.

VC55 Status

Fairly frequent in Leicestershire and Rutland.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map