I would tend to agree with Bruce on this. I collected it in the Olympics (Elk Mountain) and Cascade mountains for my dissertation on alpine lichens in WA. The elevation sounds right.
U. havaasii have gyros apothecia, but when young they sometime appear to look like the sterile button in the middle.
Bruce is right about the ridges in U. polaris, they would be much more pronounced than what I see in your photos.
Might you have other thalli in the collection to photograph, show variation in the collection and to confirm species?