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I’m not really good with crusts, but there are two common ones that are more or less identifiable by sight, C. trachyphylla and C. ignea. Both have distinct fingery lobes around the margin (the vast majority of Caloplaca are just stains or crusts with indistinct or solid margins). On the coast ignea should be more common, I think. Also trachyphylla should be distinctly rough-textured and is often sort of dull or dusty-looking (unless it’s rained recently). Ignea should have shorter lobes and be redder (if I remember right). Unfortunately I can’t really tell any of this from the photos.
Created: 2011-03-01 15:10:10 GMT (+0000)
Last modified: 2011-03-01 15:35:09 GMT (+0000)
Viewed: 52 times, last viewed: 2017-06-08 15:24:48 BST (+0100)