Observation 91208: Parmotrema perlatum (Hudson) M. Choisy
When: 2012-03-17
Who: zaca
No herbarium specimen

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Can you believe?
By: zaca
2012-03-29 20:46:05 UTC (+0000)

But there are only five in the portuguese checklist: P. chinense; P. crinitum; P. hypoleucinum; P. reticulatum; P. stuppeum.

Far too many options
By: Jason Hollinger (jason)
2012-03-29 20:11:45 UTC (+0000)

Narrowed down dramatically, no doubt, if you only consider those on the Portuguese checklist (for whatever that is worth – you push its boundaries daily!) P. arnoldii would be my first guess, just because it is a species I’m familiar with. It looks very similar to perlatum, but has alectoronic instead of stictic acid. It looks too small for the P. robustum group, but who knows?

I also found …
By: zaca
2012-03-29 18:33:55 UTC (+0000)

that the K-reaction was weak, but what are the alternatives?

I’m concerned with the spot tests
By: Jason Hollinger (jason)
2012-03-29 18:18:26 UTC (+0000)

The spot tests seem more consistent with atranorin in cortex (bleeding into the medulla) and protocetraric or alectoronic acid in the medulla (K- C- KC+ rose quickly turning golden). If it were stictic acid such as P. perlatum has, the K test would be deeper, and it should tend to clear after applying C not become stronger.

(I agree with you that the white splotches do not indicate the hypotropum group. The overall shape of the thallus is totally wrong for that group. This is just an unusually well-developed specimen.)

Created: 2012-03-29 17:07:58 UTC (+0000)
Last modified: 2012-03-29 18:19:33 UTC (+0000)
Viewed: 36 times, last viewed: 2014-06-27 18:58:56 UTC (+0000)
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