Collection location: Larabee State Park, Whatcom Co., Washington, USA [Click for map]
Breitenbach / Kranzlin Sp# 223 Dasyscyphus niveus is correct in every way except the shape of the apothecial hairs is different. In the present species the terminal cell is not at all swollen (see micro photo).
Another species listed on Internet is D. montana: In Mycokey there is an illustration of hairs that fits description but I cannot find a complete description of this species.
More stereo images at: http://faculty.wwu.edu/fredr/3D_Photo_Main.htm
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sum(score * weight) /
(total weight + 1)