Observation 98854: Caloplaca flavorubescens (Hudson) J.R. Laundon

When: 2012-06-30

Collection location: Planalto das Cezaredas, Portugal [Click for map]

Who: zaca

No specimen available

Growing on the bark of pinus pinea.


K reaction.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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You’ve convinced me
By: Jason Hollinger (jason)
2012-07-01 20:22:07 CDT (-0400)


I uploaded a photo with the reaction to K.
By: zaca
2012-07-01 20:07:07 CDT (-0400)
This stretches the limits a bit
By: Jason Hollinger (jason)
2012-07-01 19:06:13 CDT (-0400)

I understand that there is variability in color, but yours has no yellow whatsoever in the thallus outside the thalline apothecial margins. If you could demonstrate presence of minute concentrations of anthraquinones in the thallus, I would accept C. flavorubescens without reservation. But… [K test should show some red/purple reaction even in the gray if there is any anthraquinone present in the thallus.]

(Of course, I agree it doesn’t look like C. cerina, either, because that one shouldn’t have any yellow even on the margins of the apothecia!)

Created: 2012-07-01 17:25:07 CDT (-0400)
Last modified: 2012-07-01 20:21:54 CDT (-0400)
Viewed: 57 times, last viewed: 2017-06-13 05:45:39 CDT (-0400)
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