Buellia aethalea is a crustose lichen found on acidic rock. The pictures here are on slate. It has a global distribution.

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Photo credit: © Peter Martin Rhind / Alamy / Afripics
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Keywords: acidic, aethalea, areolate, buellia, crustose, distribution, global, lichen, mosaic-forming, national, north, park, physciaceae, pioneer, recorded, rocks, snowdonia, thallus, wales