Observation 80467: Parmotrema A. Massal.
When: 2011-10-23
Who: zaca
No herbarium specimen

Notes: Parmotrema again!
The chemical reactions: C-, K+y, KC+y, that I repeated because it seems to me that some faint tone reddish appeared with the same results, seem to indicate Parmotrema chinense. However, to my experience, this species does not have:
- whitish zones like this specimen presents mainly at the centre of thallus;
- Black dots (Pycnidia?) at the lobe tips:
- So many cilia;
- Soredia not confined to the end of lobes.
Therefore, it maybe another species. Which one?

Images

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Inicial chemical reactions (top); Repetitions of chemical reactions (bottom); Underface of lobes (center).

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In fact,
By: zaca
2011-10-25 02:52:34 PDT (-0700)

all your comments seem plausible and thus it may be P. chinense. In particular, the thallus is so thin that I had trouble scraping off the upper cortex without going through to the black lower cortex.

I think this is consistent with variation of P. chinense
By: Jason Hollinger (jason)
2011-10-24 17:11:17 PDT (-0700)

Cilia are more commonly present than not. White patches in interior might be dead or sunburnt tissue. Black spots may be bits of lower cortex showing through. (P. chinense has a very thin thallus; I frequently have trouble scraping off the upper cortex without going all the way through to the black lower cortex when doing spot tests on the medulla.) Lastly, soredia can form wherever the cortex is abraded or damaged. I’d say the soralia in this specimen are still predominantly marginal near lobe tips.

Created: 2011-10-24 13:23:12 PDT (-0700)
Last modified: 2011-10-24 13:23:51 PDT (-0700)
Viewed: 45 times, last viewed: 2016-10-28 16:04:46 PDT (-0700)
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