Tiny grey lichen on landward side of concrete sea wall
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.
The circled group of apothecia might well be L. dispersa in the strict sense, but they are rather tightly grouped and might be seated on a black thallus. Consequently this might be L. semipallida. The apothecial margins of this species usually have a slight creamy-yellow tint (rarely strongly yellowish), but I don't think white margins entirely rule it out.
Naming to the aggregate does seem best.
Lat/Lng: 53.7833, -3.059
OS grid ref: SD303324