Opegrapha atra
Description
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

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