A grey lichen growing on the trunk of an oak tree. Wouldn't even know where to start identifying.
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.
Links to some useful Lichen identification resources are to be found in the Fungi and Lichen forum - the link to 'Forums' is in the bar below the iSpot logo
Lat/Lng: 52.83013, -1.24997
OS grid ref: SK506261