Belonia nidarosiensis Apothecia query
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Well Beloniais supposed to have perithecia not disks, which are essentially Gyalectaapothecia with the margin curled over to leave a pore, which is not what these look like. 
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The top left [not right: dyslexia strikes] photo isBelonia russulafrom https://www.cambridge.org/core/journals/lichenologist/article/gone-with-the-wind-sequencing-its-type-species-supports-inclusion-of-cryptolechia-in-gyalecta-ostropales-gyalectaceae/889C4400FD8699D62D05F53AD71C6DDF ” class=”bbcode_url”> https://www.cambridge.org/core/journals/lichenologist/article/gone-with-the-wind-sequencing-its-type-species-supports-inclusion-of-cryptolechia-in-gyalecta-ostropales-gyalectaceae/889C4400FD8699D62D05F53AD71C6DDF Not having seen
B. nidarosiensisperithecia, not sure but does not look like what I would expect. Neil
I agree with Neil in very much doubting that the discoid apothecia belong to Belonia. They look more like the apothecia of a Bacidia species. Despite the hundreds of churchyards that I have recorded, and the numerous colonies of B. nidarosiensis, I have never seen it fruiting. I have to say that I am rather dubious about many records of B. nidarosiensis (I think the name is often applied to various orange or pink crusts, including free-living crusts of Trentepohlia alga). 
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The sort of crust shown above is very common on shaded vertical stonework and I interpret this as a non-lichenised Trentepohlia crust, the pinkish pruinose appearance due to crystallisation of calcite on the algae (presumably due to repeated wetting and drying).
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The pale pastel pink crust (overgrowing moss in this case) above is the sort of material that I record as B. nidarosiensis.The images on the lichensmaritimes site look convincing (in almost every case) for B. nidarosiensis in my opinion.
http://www.lichensmaritimes.org/index.php?task=fiche&lichen=319&lang=en Back to the original query, and I think the most likely explanation is that we have a crustose lichen with disc-like apothecia (perhaps a Bacidia species) and that, growing in a shaded situation, the thallus has been much overgrown (perhaps even invaded) by Trentepohlia. I can’t prove this to be the case but it is my strong suspicion. It is the sort of query where I wish I could cut a section as that would almost certainly resolve the matter.
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