Observation 50474: Caloplaca Th. Fr.

Locality: Green Mountain Reservoir, 15 mi southeast of Kremmling, White River National Forest, Colorado, USA, el. 7,400 ft

Identification: It would be very helpful to have some clear photos of the undersides of a few lichens such as this one that seem to resemble Xanthoria elegans to some extent but may actually belong to the genus Caloplaca. Alas, …


Proposed Names

-28% (1)
Recognized by sight
28% (1)
Used references: Stridvall’s Caloplaca photos

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If you saw the wonderful series by the Stridvall’s,
By: zaca
2010-08-16 20:32:12 CDT (-0500)

then you probably noticed that some photos of C. aurantia are very similar to your specimen, at least I think so. However, as far as I could see, this species in not mentioned in the Checklist of Colorado.

apothecial margins
By: Chris Parrish (kitparrish)
2010-08-16 19:48:00 CDT (-0500)

I’ve been looking through quite a collection of Xanthoria and Caloplaca photos, especially a wonderful series by the Stridvall’s, and noticed that most Caloplaca have bold exciples a lichen can be proud of, but in many photos of Xanthoria elegans many apothecia might be quite rimless. I don’t find mention of this in the books I’ve been reading.

I agree
By: Jason Hollinger (jason)
2010-08-16 19:34:35 CDT (-0500)

I’m unsure of the line between Caloplaca and Xanthoria elegans, as well. In at least some cases X. elegans comes completely free from the substrate in places. This should never happen with a true Caloplaca (such as C. trachyphylla for example). Problem is I’ve never succeeded in coercing a specimen of X. elegans off its substrate and remain intact. It’s worth noting, maybe, that all specimens that I feel confident are X. elegans also have narrower, more separate, smoother, and more convex lobes than C. trachyphylla.

Created: 2010-08-16 19:16:11 CDT (-0500)
Last modified: 2010-08-16 20:46:53 CDT (-0500)
Viewed: 38 times, last viewed: 2019-02-05 03:37:56 CST (-0600)
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