On an oak twig. These ones seems especially difficult - loads to choose from.
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.
This is so wet that I can't decide if it has the soredia of Parmelia sulcata or the isidia or P. saxatilis! I'm leaning towards the latter. Definitely Parmelia though.
Lat/Lng: 51.072, -0.69
OS grid ref: SU918311
In mixed broadleaved woodland, altitude 238m, oak, birch, chestnut and willow nearby.