Observation 96637: Caloplaca ulcerosa Coppins & James
When: 2012-06-03
Who: zaca
No herbarium specimen
0 Sequences


Chemical reactions.
Spore (12.5 × 6 µm; isthmus 6 µm).
Another specimen nearby.

Proposed Names

47% (2)
Based on chemical features
56% (1)
Used references: British Flora

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Thanks again, Jason.
By: zaca
2012-06-08 15:28:20 MDT (-0600)

In the meantime I received the copy of the paper you sent me and I’ll look to it.

Yes I see!
By: Jason Hollinger (jason)
2012-06-08 15:01:15 MDT (-0600)

Hard to reconcile the key in the paper with those photos! :) But there, you see the soredia are conspicuously orange, and there are hints of orange here and there in the thallus. It’s plausible. In any case, I think it does not match yours.

The other species sort of close in the key is C. sorocarpa, but it has convex areoles, and tan to brown margins. C. ulcerosa isn’t supposed to have a prothallus, but I don’t know how important that is. It’s possible it’s none of the above. But for now, C. ulcerosa is the best name I can find.

As you can see …
By: zaca
2012-06-08 14:35:18 MDT (-0600)

in Stridvall Caloplaca gallery the photos show a whitish grey thallus, just like in my specimen. Thanks, Jason, for sending me the paper.

Bright orange thallus, so no way
By: Jason Hollinger (jason)
2012-06-08 14:28:09 MDT (-0600)

I’ll send you the paper…

Jason, one more favour:
By: zaca
2012-06-08 14:06:28 MDT (-0600)

I was looking to “Stridvall Caloplaca gallery” and saw a species that is similar to mine: C. chrysophthalma. I tried to see a description of it in “CNALH”, but only a reference to a recent publication appears, which is:
“Wetmore, CM 2004: The sorediate corticolous species of Caloplaca in North and Central America. – The Bryologist 107(4): 505-520.”
Maybe you can see the details there.

Biritsh Flora suggests Caloplaca ulcerosa
By: Jason Hollinger (jason)
2012-06-08 14:01:35 MDT (-0600)

There are some photos on-line (google image search). It has thin white crustose film, on nutrient rich bark. Soredia in discrete tiny pustules or craters, gray to yellow-green. Crust and soralia K-. Apothecia with orange disk and proper exciple but white thalline rim (which may be excluded). Spores 8-12×4-8µm, septum ⅓-½ of the length of the spore.

No, this is a Caloplaca,
By: zaca
2012-06-08 12:16:18 MDT (-0600)

though a non usual one. It seems that some soredia exist (at least some sort of vegetative propagules) and the apothecia are of a non usual form. In this case I saw a spore of it and I uploaded a photo with it. There was another specimen nearby and I also uploaded a photo of it. In this one the apothecia are “more opened” than in the first one.

Have you considered Brigantiaea?
By: Jason Hollinger (jason)
2012-06-07 18:14:46 MDT (-0600)

British Flora lists Brigantiaea fuscolutea. It is K+ wine-red like Caloplaca but has muriform spores and K+ yellow thallus.

Created: 2012-06-07 16:48:34 MDT (-0600)
Last modified: 2012-06-08 14:02:15 MDT (-0600)
Viewed: 62 times, last viewed: 2017-06-13 01:19:03 MDT (-0600)
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