Observation 280651: Caloplaca Th. Fr.

On siliceous rock.

Thallus effigurate, light orange, darker in center. Lobes elongated, flat, smooth, tightly adnate, widening at tips where lighter in color than center of thallus, not concave, epruinose. Lobe divisions often touching or folded, to somewhat overlapping. Apothecia uncommon, situated at proximal area of marginal lobes, not specifically in the center of the rosette. All parts K+R.


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I think we just need to see more of all these things
By: Jason Hollinger (jason)
2017-07-03 00:53:17 CDT (-0400)

There’s clearly variation in at least some of these species that we don’t understand yet. Of the ones present in this area, the only one I feel very comfortable with is C. saxicola, having seen hundreds of specimens all over the west. This is definitely not that. I think we both have seen C. ignea enough to know typical material, but not necessarily atypical material. As for the others…

Do we have to??
By: J-Dar
2017-07-03 00:40:28 CDT (-0400)

Something just doesn’t feel right, but maybe because I don’t feel all straight with C. ignea in general.

There is a hillside of good serpentine rock nearby, I need to look to see if “normal” C. ignea is up there.

Okay, then since we can rule out just about everything else…
By: Jason Hollinger (jason)
2017-07-03 00:06:21 CDT (-0400)

Just going through species in Wetmore & Kaernefelt. 1998. The lobate and subfruticose species of Caloplaca in North and Central America. The Bryologist 101(2): 230-255:

C. eugyra — Inland species, supposed to be whitish pruinose.
C. trachyphylla — Inland species, lobes strongly verruculose and convex.
C. saxicola — Smaller species, etc. see earlier comment
C. impolita — Should be pruinose.
C. appressa — Mexican species.

This leaves only C. brattiae and C. ignea. C. brattiae has “strongly convex” lobes at the tips, so can we rule that one out since yours has clearly flattened lobe tips?

So if you’ve ruled out everything else, the thing that remains must be it, right? Can this just be a shade form of C. ignea maybe??

Lobe Pruina?
By: J-Dar
2017-07-02 23:35:27 CDT (-0400)

Here’s a couple shots of the lobes up close, at most I would say they are somewhat finely scurfy. I’ve seen what I think is Caloplaca impolita (observation 209204), and this is different. And I agree this isn’t right for C. saxicola. I should slice and dice and look at spore isthmus length and medulla granules/crystals.

I’m pretty sure this is not C  saxicola
By: Jason Hollinger (jason)
2017-07-02 20:18:08 CDT (-0400)

I wish I were more familiar with the coastal species. Maybe this magic yellow pruina on C. impolita is variable? That is sure how it comes out when I key it, based on the broadened, flattened, yellower lobe tips.

C. saxicola is a much smaller species, with abundant apothecia, oranger, same color throughout, areolate in the center, and convex lobes throughout.

Subgenus Gasparrinia
By: J-Dar
2017-07-02 18:49:48 CDT (-0400)

Caloplaca saxicola group. This group of Caloplaca has radiating marginal lobes, thallus that forms rosettes, thallus parts flattened. This specimen doesn’t have the yellow pruina on the lobe tips like Caloplaca impolita, so the best bet is Caloplaca saxicola, assuming that the few apothecia present originate immersed near the lobe tips.

Created: 2017-07-02 18:45:04 CDT (-0400)
Last modified: 2017-07-02 23:21:43 CDT (-0400)
Viewed: 53 times, last viewed: 2019-08-20 08:43:53 CDT (-0400)
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