An unidentified crustose lichen
An unidentified crustose lichen growing on the bark at the base of a large Quaking Aspen (Populus tremuloides). It was the only one seen on this tree and no others were found on any nearby trees. The thallus is thick, smooth but with cracks. There do not appear to be apothecia but irregularly shaped soralia with yellow soredia are present. There are a few dark black spots mixed in among the soralia.
No species identified
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