A light sage green colour. covering many of the trees on this forest trail. Looks like the foiliage of the tree at first, but then when you get closer, you realise its a lichen.
No identification made yet.
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Unless my eyes deceive me, you appear to have Evernia prunastri in the foreground in the close-up, and an Usnea sp. in the background. The latter requires very close inspection to arrive at a name. There is probably Ramalina (another shrubby genus) elsewhere on the tree.
Lat/Lng: 56.48919, -5.39801
OS grid ref: NM908381