Notes: Occurs on a sandstone outcrop on a small hilltop with scattered Quercus douglasii, but otherwise in a semi-arid grassland setting.
Thallus light orange, sometimes more orange in center, lobes short elongate, 1-2mm, flat, with yellowish-orange pruina and most have very slightly raised tips (not appressed), although this doesn’t seem to be a good character. Apothecia common, <1mm, concentrated in center of thallus, with thick raised thalline margin concolorous with thallus, pruinose when young, disc same color with slight pruina, isidia and soredia absent, K+R.
Of course, ID is technically based on spore isthmus size and crystals/granules in the medulla, neither of which was examined here. Other options include C. saxicola and C. appressa, but general description and keys suggest C. impolita.
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C. trachyphylla has a distinctly roughened texture, unmistakable. At least in the Great Basin. I’ve wondered whether it converges with the coastal species and becomes more smooth near the coast. Wouldn’t that be perverse?
Created: 2015-07-07 21:04:08 PDT (-0700)
Last modified: 2015-07-07 21:04:13 PDT (-0700)
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