Fruticose lichen on ash trunk. Grey colour, flattened branches. Pale green patches of soredia on branches. Possibly Ramalina farinacea.
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: 52.3124, -0.3206
OS grid ref: TL145695