Observation 109295: Parmotrema hypoleucinum (Steiner) Hale
When: 2012-09-08
Who: zaca
No herbarium specimen

Notes: This one key out as Parmotrema perlatum using the key in the British Flora, but I have some doubts about the result.

Proposed Names

29% (1)
Used references: Smith et al., The Lichens of Great Britain and Ireland, The British Lichen Society, 2009.
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Definitely
By: Jason Hollinger (jason)
2012-09-11 22:10:33 CEST (+0200)

Sorry, I get P. hypotropum and P. hypoleucinum mixed up all the time. They are indistinguishable without access to TLC… which as far as I’m concerned makes them the same species(!)

I was just reading Mason Hale’s monumental study of the Xanthoparmelia conspersa group, in which he collected 3,617 specimens from eastern USA and discussed the generations of lichenologists who have struggled to make sense of the senseless varation in that group. Hale’s bewildering conclusion was to ignore everything but the color of the underside, and name species purely based on subtle differences in chemistry(!) Astonishingly, this has held up for over 40 years. Mainly because no one has been able to recommend anything better. Recently the first exploratory studies using molecular techniques have suggested that it is a complete disaster.

At least Parmotrema has some useful morphological characteristics that seem to be very consistent. But, still, there are groups like P. hypotropum and P. robustum, etc. purely defined by chemistry. I have a very hard time believing these will survive the molecular revolution.

Yes, but …
By: zaca
2012-09-11 21:47:02 CEST (+0200)

I could not find any reference to the species Parmotrema hypotropum in the southwest of Europe. Only the similar species P. hypoleucinum is referred in the checklists of either Portugal and Spain.
On the other hand, none of such species exists in UK and the British Flora that only mentions five species of Parmotrema: P. arnoldii, P. crinitum, P.perlatum, P. reticulatum, P. robustum. So, when in my notes I said that it Keys out as P. perlatum I was referring to this universe.
All together maybe the best choice is P. hypoleucinum. Don’t you think so?

This looks like P. hypotropum
By: Jason Hollinger (jason)
2012-09-11 07:42:25 CEST (+0200)

There are probably quite a few species in your area missing from the British Flora, if they only have 5 species.

(Although, there you go again with the weak K reaction for what supposedly should have norstictic acid…)

Created: 2012-09-10 22:19:56 CEST (+0200)
Last modified: 2012-09-11 22:29:01 CEST (+0200)
Viewed: 74 times, last viewed: 2016-10-23 15:33:40 CEST (+0200)
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