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you would be able to see clearly what the soredia/isidia/blastidia looked like, where they occurred (scattered, continuous, on margins of areoles, etc.) I agree that it seems unlikely the British Flora will help, even knowing these things, but it might help you should you run across this sort of thing again. Or if we ever find a paper that covers the sorediate saxicolous Caloplaca of southwestern Europe.
but even if he had (I know where observed it) what could do with it?
But there might also be little orange pock-marks scattered about, a bit like soralia. It’s only natural to suspect soredia or isidia in a thallus this large which has so few mis-shaped apothecia. I’m looking at your image in full-resolution, but it’s just no substitute for having the specimen in hand, under a 30x dissecting scope! Still, even assuming it’s one of soredia, isidia or blastidia, none of the species in the British Flora seem plausible.
like a pruina than soredia; In any case it is like powder.
Created: 2012-08-11 16:39:19 PDT (-0700)
Last modified: 2012-08-11 16:39:22 PDT (-0700)
Viewed: 28 times, last viewed: 2016-10-21 21:22:14 PDT (-0700)