Lichens are a headache for me when it comes to naming them. I think they are fascinating organisms but have they a structure and accompanying language all of their own which I struggle to understand! There are several of these orange, crusty ones so I have to use all the powers of deduction I have to try and make an educated assessment of what each is and, as far as I can tell, this is Caloplaca heppiana.
Caloplaca heppiana is very common on calcareous rocks rather than bricks (see Candelariella aurella) and forms even, closely compressed oval shapes with large orange disks in the centre. More orange in colour than Xanthoria periatina which is also very common but more so wood substrates. Telling it apart from Caloplaca saxicola is more difficult but that seems to grow in to a larger, less even shape.
So, for me, this has to be Cladonia heppiana but do tell me if you think I am wrong!
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