Observation 68690: Punctelia borreri (Turner) Krog
When: 2011-06-03
Who: zaca
No herbarium specimen

Proposed Names

58% (1)
Eye3 Eyes3
Used references: Irish lichens
Based on chemical features: See attached photos.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Nice exercise, Jason.
By: zaca
2011-06-06 14:19:50 PDT (-0700)

I can confirm that the underside was black, and that the chemical reaction was C+ pink.

Have you ruled out P. subrudecta?
By: Jason Hollinger (jason)
2011-06-06 14:14:59 PDT (-0700)

According to my info, you should consider several species when presented with fine soredia like this:

Black below:

P. stictica (on rock, typically very brown)
P. borreri (on bark, not brown)

Pale below:

P. subrudecta (European)
P. perreticulata (very distinctly ridged)
P. jeckeri (pruinose at very tips)
P. caseana (varied, only known from N. Amer. last I checked)

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)
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