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I can confirm that the underside was black, and that the chemical reaction was C+ pink.
According to my info, you should consider several species when presented with fine soredia like this:
All should be distinctly C+ dark red. The only sorediate one NOT C+r is P. reddenda, but it is C-, not C+ pink. (Am I misinterpreting your spot test?)
Ah!! My mistake. P. borreri is C+ pink not C+ red. I’m now in total agreement with you. Nice to finally see an excellent specimen of this elusive species.
(I’ll leave the comment in case it’s useful for creating a species description some day, sorry about that.)
Created: 2011-06-06 13:38:18 PDT (-0700)
Last modified: 2011-06-06 13:38:36 PDT (-0700)
Viewed: 54 times, last viewed: 2016-10-23 14:09:38 PDT (-0700)