Lecanora horiza


    It has a distinctly cracked and warted thallus above a white prothallus and glossy orange or brown discs often aggregated into clusters.

    Similar Species

    Lecanora campestris is similar but can be distinguished with care.

    Identification difficulty
    Recording advice

    Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


    On bark of deciduous trees, especially mature Ash, Sycamore and Elm. Also on rock, especially vertical calcareous gravestones and brick of churches.

    When to see it

    All year round.

    UK Status

    Scattered throughout southern Britain and eastern Scotland.

    VC55 Status

    Status in Leicestershire and Rutland not known.

    Leicestershire & Rutland Map

    MAP KEY:

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

    UK Map