common, especially on bark of hardwoods (gambel oak, cottonwood, aspen)
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|I’d Call It That||3.0||9.12||2||(jason,Metalbator)|
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I do not know X. Montana, a western species, so you may be right.
Looks like there’s 2 Xanthomendoza here: X. fallax (center right) and X. hasseana or Xanthoria polycarpa (the fertile one)?