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.

be our species champion

Leicestershire & Rutland Map


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

UK Map