Thallus foliose, green-grey or distinctly yellow-grey (but commonly appearing pure grey in digital photographs or with digital printing technology), lobes radiating, usually narrow and somewhat serpentine, often convex in cross-section or flattened at the tips, cracked and brown in the centre part of the thallus, with subglobose yellow to grey-yellow soralia on the lobe surfaces, lower surface black; apothecia small, with brown discs and pale, crenulate margins, said to be rare.
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 exposed, base-poor rocks and gravestones, able to colonise various man-made surfaces.
All year round.
Widespread and locally common in Britain.
Widespread and quite common in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015