Observation 204800: Xanthoparmelia plittii (Gyeln.) Hale

When: 2015-05-13

Collection location: Petenwell Rock, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Are you taking these photos throught the microscope? I don’t have a setup of that nature.
By: Andrew Khitsun (Andrew)
2015-05-23 17:20:33 CDT (-0400)

And I’ve thrown away the small piece of the lichen I took just to ID the species, since it wasn’t of Herbarium quality, and plenty of records exist from that county of the same species.

By: J-Dar
2015-05-23 13:28:20 CDT (-0400)

There’s a photo of the orange coloration of my K test at observation 203954. It held at this color and did not fade or get any darker or redder.
Let’s compare!

Quick comment on color of K test on stictic acid syndrome
By: Jason Hollinger (jason)
2015-05-23 00:05:58 CDT (-0400)

It can be anywhere from just yellow staying yellow, to yellow turning bright orange-red. Not sure if it’s due to differences in concentration or the relative mix of closely-related acids. Would be interesting if X. plittii typically gives more red reaction in Great Lakes region than on California coast. What in the world would that mean??

Will do
By: J-Dar
2015-05-22 21:46:43 CDT (-0400)

Color is difficult, and really terrible in keys when you have to make a subjective decision, thanks for the info!

K+yellow turning red is not blood red – yes it’s orangish red.
By: Andrew Khitsun (Andrew)
2015-05-22 21:31:20 CDT (-0400)

I am stumped when forced to describe particular color, for color perception is a relative thing (for me, anyways). As far as lobes go, I mostly use keys in Thomson Lichens of Wisconsin, and it doesn’t have lobes as key factor. The width of lobes is in description of species, and is given as 1-2 mm broad. See my other X.plittii – I have a bunch on MO – to check what kind of lobes they have.

Lobes and chemistry
By: J-Dar
2015-05-22 20:49:48 CDT (-0400)

Hi Andrew, is it normal for X. plittii in your neck of the world to have such narrow lobes? I am very much not familiar with the genus or this species other than one observation (for the species) that is not confirmed, observation 203954. Also, the medulla I think should be K+Y turning orange, not red, at least here on the West Coast, but maybe that is consistent throughout its range? Xanthoparmelia mexicana is isidiate with medula turning dark red in this area.

Isidiate, lower surface pale, medula K+yellow then red. On Sandstone
By: Andrew Khitsun (Andrew)
2015-05-22 19:45:22 CDT (-0400)

Created: 2015-05-22 19:39:33 CDT (-0400)
Last modified: 2015-05-22 19:43:54 CDT (-0400)
Viewed: 59 times, last viewed: 2017-06-20 04:31:39 CDT (-0400)
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