Lichen: Placynthium nigrum | Nature Notes from Dorset

I know lichen are an acquired taste and that people, in general, prefer the more exotic wildlife; orchids, for example, or the more dramatic animals such as birds of prey. I do my best to try and enthuse people with these lower organisms which are all too often over looked but I can find little to say in support of Placynthium nigrum!
It is a dull, black crust that grows on hard calcareous substrates and so it is very common on walls and tombstones. Apart from being black and crusty

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