muddy looking brown lichen, could not see any fruiting bodies
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.
I have clicked an agreement for Verrucaria viridula. I cannot make out the perithecia in the photographs, but the 'jizz' looks right. In any case, it is a horribly variable species.
Lat/Lng: 50.5949, -1.1987
OS grid ref: SZ568775
growing on concrete.