Collection location: San Luis Obispo Co., California, USA [Click for map]
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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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…
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.
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??
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 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.
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)