Observation 109642: Xanthoparmelia coloradoënsis (Gyelnik) Hale

When: 2012-09-14

Collection location: Turnbull National Wildlife Refuge, Spokane Co., Washington, USA [Click for map]

47.4125° 117.4091° 709m

Who: nastassja (Nastassja Noell)

No specimen available


Upper cortex yellowish green, shiny. Black rhizines. Looks like Xanthoparmelia, but has KC+ red medulla, so should not be a Xanthoparmelia. And I’ve checked it twice… but KC+R indicates that it may be an Arctoparmelia, but that gets a dead end.

Substrate: Basalt.

medulla: KC+R, P+orange, K-,C-; cortex: all appear negative.

Proposed Names

28% (1)
Recognized by sight
Used references: Goward’s “Lichens of British Columbia”
Based on chemical features: medulla: KC+R, P+orange, K-,C-; cortex: all appear negative.
83% (1)
Eye3 Eyes3
Used references: Goward, “Lichens of British Columbia”
Based on chemical features: Cortex KC+yellow Medulla: K+red, KC-, P+orange.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: nastassja (Nastassja Noell)
2012-09-14 13:21:37 PDT (-0700)

Yes, separate applicators that are labeled (these days are long thin wooden sticks that I change out every couple days), gotta remember to clean out my little containing dishes every day now though, the precipitate… except thank goodness for the P precipitate, being able to just add alchohol for a few extra runs is fantastic!

By: Jason Hollinger (jason)
2012-09-14 13:07:14 PDT (-0700)

Be careful of contamination, too. I’m told that a single drop of C in K (or was it vice versa?) is enough to ruin the batch. But I assume you use separate applicators (labeled?) so it shouldn’t have been an issue. Weird stuff just happens sometimes.

The underside
By: nastassja (Nastassja Noell)
2012-09-14 12:56:15 PDT (-0700)

is mainly hot chocolate brown, but some are black.

Filled a new cup with K for me to dip my applicator in (the precipitate at the bottom was probably increasing the percentage of solute and creating some issues… now I know!) Thanks for the advice of checking my chemicals. Just tested the K on a Xanthoria and got a R. So now I’m getting a KY fading to bright R on the Xanthoparmelia, and KC+yellowish on the cortex, KC+red on the medulla … realizing that was an operator error. Uh oh.

So yes, X. coloradoensis! Case closed.

Weird chemistry
By: Jason Hollinger (jason)
2012-09-14 11:20:48 PDT (-0700)

K- C- KC+ P+ (if due to a single substance) can only be protocetraric acid, but that would never give a lasting deep KC+ red like what you show. All really KC+ red things should also give some fleeting (at least) C+ pink or red, as well.

…I have to at least ask… Have you verified that your K is still good?

What you have there really looks like Xanthoparmelia coloradoensis or kin, but those would be K+ of course.

Also, you say black rhizines, is it black all over below? That really narrows down options (and rules out coloradoensis). Are there any isidia anywhere? If not, you’re looking at X. tasmanica or something more exotic, like X. hypomelaena (with fumarprotocetraric acid: K~ dingy C- KC- or fleeting pink P+ orange).

Created: 2012-09-14 10:31:00 PDT (-0700)
Last modified: 2012-09-14 12:57:33 PDT (-0700)
Viewed: 33 times, last viewed: 2017-06-13 23:45:12 PDT (-0700)
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