Observation 90940: Xanthoparmelia plittii (Gyeln.) Hale

When: 2012-03-25

Collection location: Ableman’s Gorge State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

57% (1)
Eye3 Eyes3
Used references: ID provided by Jim Bennett

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Good story between the lines… or should I say “cross-outs”
By: Jason Hollinger (jason)
2014-09-28 15:51:41 PDT (-0700)

A friend just helped with a systematic study of the Parmotrema subrigidum group, involving going back and verifying K tests… and found many had been incorrectly labeled K-. She found that thalli would often test K- in places but K+ yellow to red (norstictic) in other places.

Ugh. Moral: Don’t trust those K- results!

Jim Bennett confirmed ID X.plittii
By: Andrew Khitsun (Andrew)
2014-09-28 15:27:02 PDT (-0700)

But it’s not just me who struggled. Jim first crossed my X.plittii ID and put X.subramigera, then he crossed that one and put the original name back. He also did several tests, and showed either K- or K+Y→OR/BR. Apparently different parts of lichen test differently, making ID very difficult.

Uh oh
By: Jason Hollinger (jason)
2014-07-15 14:17:19 PDT (-0700)

I hate when my spot tests are wrong! I was using faulty K for months on 1000’s of specimens from eastern Washington. Fortunately the colors were mostly right, but it wasn’t producing needle-shaped crystals for norstictic acid, so I’d gotten dozens of ids wrong as a result. Doh! I guess this is why the folks at NYBG insist that every specimen be verified by two of them. How’s that for dedication??

J.Bennett consistently showed K+ yellow
By: Andrew Khitsun (Andrew)
2014-07-02 19:08:16 PDT (-0700)

I shall refresh my KOH solution

That’s what you’d expect
By: Jason Hollinger (jason)
2012-03-25 23:53:12 PDT (-0700)

Fuarprotocetraric acid is often described as “dingy” in K. Very strong KOH solution should cause a distinctive brown reaction. Both stictic and norstictic acid will be very clearly strongly yellow right from the start.

Isidiate, lower surface white, medula K-
By: Andrew Khitsun (Andrew)
2012-03-25 18:14:49 PDT (-0700)

At first medula’s got a bit yellowish when K was applied, but I think it’s just a color of it when wetted (or is’ it supposed to stay white?). Then it became greenish just like the surface.

Created: 2012-03-25 18:05:39 PDT (-0700)
Last modified: 2014-07-02 19:07:17 PDT (-0700)
Viewed: 35 times, last viewed: 2017-06-12 16:57:53 PDT (-0700)
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