Light-brown, lumpy, crustose lichen with black prothallus growing on coastal, cliff-top, siliceous rocks. Black lecideine apothecia. Possibly Lecidella asema.
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 for help with this and other recent lichen identifications.
Lat/Lng: 51.7371, -5.2478
OS grid ref: SM758092