Black simple rhizines - top right of picture (not cilia as mentioned below) and sorediate lobes.
Found on twig below oak tree in ancient woodland.
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.
Thanks Alan for help with ID
Lat/Lng: 51.94601, -1.19098
OS grid ref: SP557278