Observation 101271: Lepraria vouauxii (Hue) R.C. Harris
When: 2012-07-13
Herbarium specimen reported

Proposed Names

29% (1)
Recognized by sight
57% (1)
Eye3 Eyes3
Based on chemical features: TLC by Jason Hollinger

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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You’re probably correct
By: Jason Hollinger (jason)
2012-07-17 17:07:42 CDT (-0400)

But I understand how easy it is to doubt yourself with these tests when they come back negative. Lack of reaction just isn’t very reassuring! And this is the least “useful” outcome. Being as optimistic as possible, I still can only narrow it down to three spcecies: L. diffusa, L. membranacea, L. vouauxii. Still it’s good to have made the effort, because when you get the official results, they will mean more…

Better left to Pros
By: Andrew Khitsun (Andrew)
2012-07-17 16:45:25 CDT (-0400)

My UW test didn’t produce any results – but it’s my very first UW test, with untested (by me, anyways) blacklight from Germjuice.com . My P test didn’t produce any results either, but my preparation techniques (might be too diluted, Isopropyl used as alcohol) leave some doubts.
Otherwise, it’s on sandstone bluffs in partial shade (relatively well exposed compared to species liking dark, damp locations).

In this case it should be okay
By: Jason Hollinger (jason)
2012-07-17 15:44:13 CDT (-0400)

Just assume it is Lepraria, and obviously use the second key for Lepraria (the one that doesn’t require TLC! :) It does help to decide what the chemistry is before starting the key, though. The K+ brown could be fumarprotocetraric acid, or it could just be the K dissolving the thallus and actually be K- (or are you sure it is an actual brown reaction?) You can rule out all the C+/KC+ pink/red things immediately. I’d like to rule out a UV+ xanthone (I’m trying to account for the yellowish color). After that you just need to know if it is UV+ white (divaricatic acid, etc.), P+ yellow (psoromic or thamnolic acid), P+ red (fumarprotocetraric acid most likely) or P- (??). Habitat/substrate and geography should take care of the rest. Obviously there are still some difficult groups, but that’s just the best we can do without TLC.

I do have Lendemer’s keys
By: Andrew Khitsun (Andrew)
2012-07-17 15:30:52 CDT (-0400)

But I’m not experienced enough to navigate the humongous pyramid. Usually I tend to take a wrong turn somewhere (or lack some ID tool) and fail to ID. I can be more or less successful when only dealing with a handful of choices (like working within one genus, toward the end of key pyramid usually)

Bizarre color
By: Jason Hollinger (jason)
2012-07-17 15:22:44 CDT (-0400)

Be sure to do UV test, too. You’ve got Lendemer’s key to sterile crusts of North America, right?

This was difficult to photograph,
By: Andrew Khitsun (Andrew)
2012-07-17 15:18:32 CDT (-0400)

since most of the best ones were in inaccessible places (on vertical part of bluff). Looks like some sort of Lepraria, but yellowish. Also, K test produced instant dark brown reaction. C test right on top of that bleached it out immediately. On its own C didn’t produce visible results. I didn’t do P test yet.

Created: 2012-07-17 15:11:44 CDT (-0400)
Last modified: 2017-04-03 20:19:25 CDT (-0400)
Viewed: 26 times, last viewed: 2017-06-13 08:23:40 CDT (-0400)
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