Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Thanks for the ID, this was my first look at lichens on gravestones so I wasn't sure how easy it was to separate members of this genus.
While the lobate species like this one can usually be identified on sight, more challenging are those that lack an obvious thallus and present themselves as apothecia that appear to sit directly on the substrate. Caloplaca is undergoing revision and I believe it is about to be split into new genera.
Lat/Lng: 52.6272, 1.3151
OS grid ref: TG244084