A crustose lichen on the bark of a (very wet!)ash
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 too wet and with insuffient photographic definition for identification. (Hint, gentle dabbing with a tissue can remove the surface film of water that makes many photographs unidentifiable.)
Note that if it is correctly named, which indeed it could be, Amandinea punctata is the current name (formerly Buellia punctata). Without careful examination it is difficult to separate from some true Buellia species, and from Lecidella elaeochroma.
Thanks, Alan, especially for the handy tip about tissues. I clearly have much to learn, but I am finding lichen (and fungi) a fascinating area of study. I'll check out your other suggestions and see if I can make any further headway.
Lat/Lng: 53.62512, -2.40035
OS grid ref: SD736143