Observation 95579: Xanthoria polycarpa (Hoffm.) Th. Fr. ex Rieber
When: 2012-05-25
(46.896° -120.6298° 801m)
Herbarium specimen reported

Notes: Substrate: Growing on upper branches of sagebrush.

Habitat: Rocky basaltic sagebrush steppe.

Description: Not difficult to find mature specimens. Very abundant in plot. Apothecia red, lecanorine, foliose <1mm, looks like there are soredia on terminal margins.

Proposed Names

56% (1)
Recognized by sight: the non-sorediate ones

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: nastassja (Nastassja Noell)
2012-05-29 11:48:27 CEST (+0200)

duh!! Okay, X. fallax will have broad spreading lobes,like you said below, appearing more crustose like the MO key states. X. fulva more narrow, definitely foliose. Okay got it. Thanks Jason :)

Oh definitely
By: Jason Hollinger (jason)
2012-05-29 09:33:21 CEST (+0200)

That’s the material I was trying to call X. fulva.

X. polycarpa
By: nastassja (Nastassja Noell)
2012-05-29 08:25:23 CEST (+0200)

Okay, MO key does key out to X. polycarpa, but sure does look like there’s some Xanthoria’s with sorediated terminal margins on the top photo… unless I’m totally off my rocker :) which is possible. I’ll dig up that specimen and separate out the different species.

Well sure, when very young…
By: Jason Hollinger (jason)
2012-05-28 10:47:06 CEST (+0200)

But very young for Xanthoria is minute! If it’s covered with a mound of apothecia, it no longer qualifies as young. :)

X. fallax has a sort of flat appearance with broad spreading lobes. You should definitely have it, but I don’t see anything promising in these photos.

Good key
By: nastassja (Nastassja Noell)
2012-05-28 00:47:30 CEST (+0200)

by the way :)

By: nastassja (Nastassja Noell)
2012-05-28 00:46:05 CEST (+0200)

Two, and then a third in the last photograph… can see that now. And there’s no possibility of a young X. fallax not having soredia as a youngster? :) None?

I do see the hapters on an exposed area showing the side, so X. polycarpa for one of them for sure.

Two things here
By: Jason Hollinger (jason)
2012-05-27 01:34:01 CEST (+0200)

Looks like X. polycarpa because it’s so small and mounded. (The second photo is less clear, maybe that’s X. montana / X. hasseana?)

The sorediate thing is another species, either X. fulva or X. fallax or X. ulophyllodes. It’s not the most clear-cut specimen, but I’d bet it’s _X. fulva.

Check out the description page. Thanks to Andrew K. and several other users, we’ve documented many of the species of Xanthoria on MO pretty well. (Note that X. weberi is the eastern version of X. fulva.)

Created: 2012-05-27 01:15:04 CEST (+0200)
Last modified: 2012-05-28 00:48:36 CEST (+0200)
Viewed: 122 times, last viewed: 2016-10-26 13:31:22 CEST (+0200)
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