Opegrapha corticola

Dull brown thallus scattered with flat, ochre, or often faded greenish-grey coloured soralia.

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

On old oak trunks and rocks.

All year round.

Widespread in southern England and in Wales.

Status in Leicestershire and Rutland not known.