Observation 104780: Caloplaca Th. Fr.
When: 2012-08-02
Who: zaca
No herbarium specimen

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I think if you could look at it under a dissecting microscope
By: Jason Hollinger (jason)
2012-08-12 14:56:40 CDT (-0400)

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.

I do not have a sample,
By: zaca
2012-08-12 14:16:01 CDT (-0400)

but even if he had (I know where observed it) what could do with it?

I agree, definitely pruinose
By: Jason Hollinger (jason)
2012-08-12 13:52:55 CDT (-0400)

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.

It looks to me more …
By: zaca
2012-08-12 04:32:02 CDT (-0400)

like a pruina than soredia; In any case it is like powder.

Is this sorediate?
By: Jason Hollinger (jason)
2012-08-12 03:26:02 CDT (-0400)

Created: 2012-08-11 19:39:19 CDT (-0400)
Last modified: 2012-08-11 19:39:22 CDT (-0400)
Viewed: 29 times, last viewed: 2017-06-13 12:27:50 CDT (-0400)
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