Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Have added a higher res photo showing more detail
Gardening for Wildlife
Am I right in thinking there are 2 species here, one of which is Punctelia reddenda (top left)?
I think this is more likey P. subrudecta, but I agree P. reddenda is possible. The situation is complicated by Parmotrema perlatum being mixed up with the the Punctelia.
(Takes note to have a loot at the scrub by Soulseat Loch next time I pass.)
Lat/Lng: 54.8876, -4.9563
OS grid ref: NX104587