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29% (1)
Recognized by sight: upper surface brownish green, lower surface white then orangish,on mossy soil under spruce, ponderosa pine, aspen and evergreen shrub (yew?) at about 8200’ elevation
61% (2)
Recognized by sight

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The horizontal apothecia on P. horizontalis
By: Jason Hollinger (jason)
2017-05-20 19:43:34 BST (+0100)
are hard to describe, but once you see them you’ll get it. This is tomentose on the upper surface, placing it instead in the canina group. The margins are not downturned at the edge, so most likely P. rufescens or P. ponojensis. The key difference cited in the literature is in P. rufescens the veins turn dark very quickly toward the center of the thallus, and the rhizines are a bit woolly (among other things making it very difficult to clean the dirt away from the underside). We can’t see the veins or rhizines very well, but I think the safe money is on rufescens.