ID is for the grey lichen with orange apothecia. I think the black lichen also present is Verrucaria nigrescens.
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No interactions present.
Thanks again, I wasn't even aware of this species until now ;-)
It does look like it is attacking the Verrucaria nigrescens next to it. Usually one sees it as established colonies with the former Verrucaria thallus scarecely visible underneath.
More often it seems to be on old Verrucaria viridula, or such is my own impression.
Is Caloplaca oasis widespread in the UK? I had a look at the systematic list of lichens of Norfolk (published in 1989 but I don't know of anything more recent) and it isn't on there, unless it has a synonym? I have forwarded the picture onto the county recorder in case it is of interest.
Yes, Caloplaca oasis is very widespread, especially on limestone and concrete, and is common on limestone gravestones and urban wall-cappings. It is distinct in its DNA but very closely allied to C. holocarpa (and might be better treated as a subspecies), not always easy to recognise morphologically. It often occurs in company with true C. holocarpa, though the latter is common also on non-calcareous rocks.
In the modern era it was generally forgotten until 2009, though it had been recognised as a species on the continent in 1932, and first named as a variety of something else, in Italy, back in 1856. For BLS members, the key account, with good colour photographs, is by Ulf Arup - The Lichenologist 41(2): 111–130 (2009). It is also mentioned in the latest Dobson, under C. holocarpa.
Thanks, that explains it!
Lat/Lng: 52.6272, 1.3151
OS grid ref: TG244084