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This is Diphasiastrum alpinum.
This is H selago: http://www.thewildflowersociety.com/wfs_report_menus/wfs_diapensia_2006/....
This is D. alpinum: http://www.plant-identification.co.uk/images/lycopodiaceae/diphasiastrum....
Your plant is the latter.
Perhaps you should suggest it as an id Mydaea!
I missed that the leaves were tightly appressed and the plant appears to have creeping tendrils ~ so yes its more likely to be alpine clubmoss.
Be my guest. I am not playing the reputation game.
..but I was thinking more of a correct id for the OP.
By hiding a correction in the comments, your still playing ~ just a slightly different game.
Lat/Lng: 54.485996, -3.24028
OS grid ref: NY197107