Yellow and grey circular crustose lichens
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
I have written a longer comment there about lichens on Glasgow gravestones commonly being poorly developed. Evidently a selection of three or more crustose species here, but probably not certainly identifiable.
Pin-shap close-ups are, however, necessary. (And not at all easy to obtain, I know only too well).
Again, some of this might well be Porpidia tuberculosa.
Lat/Lng: 55.8614, -4.2321
OS grid ref: NS603653