Growing on bark on a roadside tree.
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.
Looks similar to Phaeophyscia orbicularis but not sure it has bright green soredia.
Lat/Lng: 51.4918075, -0.1367198
OS grid ref: TQ294786
Growing on roadside trees.