a silvery coloured fungus
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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Think it is a Peltigera foliose lichen but not sure of species.
This is something of a puzzle. I agree it is Peltigera membranacea, but it has clusters of something along the margins.
If these clusters were isidia, then they would make the lichen P. praetextata, but that seems unlikely. I think they are some kind of fungus, growing on the Peltigera, with the fungus apparently spread over the surface too..
Peltigera is host to all sorts of things, but this looks like a hyphomycete fungus - of which a few are known on Peltigera, but seemingly none matching what we see here.
Almost interesting, but looking at it another way, it is just a mouldy lichen.
Lat/Lng: 53.7623, -2.02
OS grid ref: SD987295
attached to a stone wall alongside an unsheltered paved footpath at Hardcastle Craggs