Red-brown crustose thallus with cracks. Black lecideine apothecia with centres of discs projecting out. Possibly Rhizocarpon oederi.
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.
Lat/Lng: 51.9361, -4.8055
OS grid ref: SN072301