Observation 92685: Hypotrachyna taylorensis (M.E. Mitch.) Hale
When: 2012-04-07
Who: zaca
No herbarium specimen

Proposed Names

47% (2)
Recognized by sight
56% (1)
Based on chemical features: C test (see comments)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Maybe it is!
By: zaca
2012-04-14 20:31:14 WIB (+0700)

I saw photos of the two species and, as you pointed out, the morphological difference is clear. Thank you Jason.

Yet another new report, then!
By: Jason Hollinger (jason)
2012-04-14 07:15:03 WIB (+0700)

Gyrophoric acid (in H. revoluta) gives very weak, fleeting C+ test. Do you think maybe this just has a really high concentration? Still, H. revoluta should look different, as well: yours has very flat lobe tips, revoluta should have “revolute” tips. I personally find that it typically has very sparse rhizines underneath (mostly just along the margins), as well… but that may be an environmental or local phenotype. It’s a tough group because the morphology is either not well-understood, or has not been well documented.

Again …
By: zaca
2012-04-14 05:40:55 WIB (+0700)

the only species appearing in the portuguese checklist is Hypotrachyna revoluta.

Aha! I’ve got it…
By: Jason Hollinger (jason)
2012-04-14 05:32:01 WIB (+0700)

I looked at my notes for the species: I’ve recorded H. laevigata five times, noted the spot tests three times, each time calling the C test “fleeting”. The KC test was either orange or red/orange. Your test is clearly not “fleeting”(!) So I conclude it must be lecanoric acid. H. taylorensis (and H. rockii if you have it) are the usual suspects, but without soredia/pustules we may never know.

I can give you …
By: zaca
2012-04-14 05:03:12 WIB (+0700)

my opinion about the colors but not on the species, since my experience with Hypotrachyna is very limited: as far as I remember this is the 2nd time I identify a species belonging to this genus.
Concerning the colors: Neither reaction is pure orange or pure red; the K reaction seems to me more orange than red; on the contrary, in the KC reaction I see more red than orange, at least at the center.

Do I see apothecia starting?
By: Jason Hollinger (jason)
2012-04-14 04:43:28 WIB (+0700)

There are quite a number of things that look like budding apothecia, actually. There are no species in British Flora with apothecia(!) Only one I know from North America is H. livida, but it has different chemistry.

I don’t see pustules, soredia, phyllidia or dactyls anywhere in these photos, but that’s not necessarily unusual.

I would interpret this as C+ red (e.g., lecanoric acid, such as in H. taylorensis) not the C+ orange of H. laevigata. Do you disagree?

Created: 2012-04-14 03:27:01 WIB (+0700)
Last modified: 2012-04-14 05:32:41 WIB (+0700)
Viewed: 39 times, last viewed: 2016-10-22 12:05:38 WIB (+0700)
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