Crusty grey lichen on trunk, quite hard.
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.
Perhaps the predominant species is P. adscendens, but I think P. tenella is there as well. There is also something with soredia along the lobe margins - I think it is very dried up Phaeophyscia orbicularis (usually darker in colour, but not always).
Lat/Lng: 53.0075681, -0.4167791
OS grid ref: TF063467
Very busy main road into town