Green crustose lichen
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.
and if so, might be better termed "leprose" rather than "crustose". (Some species do have an underlying thin crust, others don't).
Lat/Lng: 55.8614, -4.2321
OS grid ref: NS603653