This name is a synonym of Carex atlantica subsp. capillacea (L.H.Bailey) Reznicek.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 225925) with original publication details: Bull. Torrey Bot. Club 35: 495 Nov. 1908.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:46072-2.
This name was in version 1 of The Plant List, record kew-225925.