a brown foliose lichen, sometimes with slighty darker edges. (Apologies for the photo, hard to get close with my camera)
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.
Lat/Lng: 53.7085, -2.0677
OS grid ref: SD956235
on S facing dry stone wall