Observation 96846: Xanthoparmelia plittii (Gyeln.) Hale
When: 2012-06-03
Herbarium specimen reported

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By: Andrew Khitsun (Andrew)
2012-07-05 01:42:21 CDT (-0400)
My instinct is that K+ orange is stictic acid
By: Jason Hollinger (jason)
2012-06-17 02:58:50 CDT (-0400)

You can verify by looking at it in KOH under a microscope. Norstictic acid should produce needle-shaped crystals. (This has failed on me, though — that is, I had J. Lendemer verify a specimen of some graphoid thing that was correct in every way except it lacked the crystals. I guess it was just too weak to see the crystals.) Brodo mentions something called buffered iodine solution (AI) which turns black with stictic acid. I don’t know much more about that. I know nothing about X. dierythra or X. norhypopsila, besides both are too bloody difficult to type. I can’t find any info about the latter, either. Stick with X. plittii until proven otherwise?

Isidiate, lower surface white, K+ yellow turning orange
By: Andrew Khitsun (Andrew)
2012-06-09 20:21:53 CDT (-0400)

Using keys in Thomson, I can only narrow this down to either X.plittii or X.dierythra . The latter lacks stictic acid if compared to former, but I don’t know how to test that. And I can’t find X.dierythra pictured anywhere. Also, there is new species in WI, X.norhypopsila, not described in Thomson (or anywhere else for that matter), and I have no idea what its morphology and chemistry are supposed to be. The unusual feature of this observation is an extra algae on the surface – something Flavoparmelia baltimorensis often displays. In fact, you can see some F.baltimorensis impinging on Xanthoparmelia territory in some of the photos.
What do you think of all this, Jason?

Created: 2012-06-09 20:05:18 CDT (-0400)
Last modified: 2012-06-17 10:47:25 CDT (-0400)
Viewed: 108 times, last viewed: 2016-10-25 01:30:25 CDT (-0400)
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