Lichen: Caloplaca heppiana | Nature Notes from Dorset

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. 

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