This was a relatively large colony living on the bark of a tree.
Because of the K+ yellow-orange reaction, according to the reference this points to C squamosa ssp. subsquamosa. However, although squamules are present in some of the podetia, don’t seem to be enough developed to match that species and looks more like C. coniocracea. Thus I hesitated in giving it a name and I mention only the genus.
To be notice the presence of the alga Trentepohlia in the first photo attached, where only some remnants are visible, but nearby there was an area where only the primary thallus of cladonia developed with plenty of the alga (see last photo attached), although the photobiont of Cladonia is known to be Asterochloris.
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If this were C.umbricola it should be K-. I think it’s strong fumarprotocetraric acid, giving a K+ red-brown, which then dilutes but doesn’t bleach out completely after you add C. Maybe we shouldn’t rule out C. coniocraea after all. Do you get a strong sense that the pycnidia at the tips are red or brown? C. umbricola should have distinctly red pycnidia. Too bad there are no apothecia, then there would be no question. Pycnidia are harder to read.
Perhaps you are right about the species. If you notice in the fifth photo (the one with the Trentepohlia all the squamules have soredia on the under side. I also have uploaded another photo where the same is visible joint with podetia, mainly on the left hand side.
The KC+ yellow reaction (most likely usnic acid) and red podetia tips suggest C. umbricola, which apparently has a thamnolic chemical race which would appear K+ deep yellow to orangish, I think. C. umbricola often has soredia under the squamules, too, but I couldn’t find any clearly so in the photos.
Created: 2010-08-24 18:03:25 PDT (-0700)
Last modified: 2010-08-24 18:03:27 PDT (-0700)
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