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

    UK Map