Crustose lichen growing on bark. Is it a Lecanora? (Apologies for the quality of the photo; it seems to be a bit better towards the left.)
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Some describe this as crustose, some call it leprose, some call it leprose as a subdivision of crustose ...
Basically it is a layer of granules, with or without underlying tissue, but it has no upper cortex ('skin').
Added in edit: ref. Lecanora - yes, some Lecanora species, notably L. expallens, become powdery sorediate across the upper surface at maturity, but they are genuinely crustose and initially have an upper cortex, that remains visible at the margins and on young thalli. Here we only see granules.
Helpful comments as always. Very many thanks, Alan.
Lat/Lng: 55.4737, -3.2026
OS grid ref: NT240206