On rotting stump in wet acidic heathland - either C. polydactyla or C. diversa?
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.
my other thought is C. bellidiflora. The squamules suggest it, and it is said to be often stunted in the south (compared with the elegant, pointy things I get up here).
However, it is not given to producing such large cups, and the overall colour and maybe sorediate look to the squamules make me think C. polydactyla is more likely.
Thanks Alan - I've added another photograph from the same thallus as it was decidedly odd but there's not enough clear detail even at full res to be sure if the squamules are sorediate at the edges
Lat/Lng: 50.7, -2.1
OS grid ref: SY9691