This name is a synonym of Carex breviculmis var. fibrillosa (Franch. & Sav.) Matsum. & Hayata.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 231616) with original publication details: J. Fac. Sci. Hokkaido Imp. Univ., Ser. 5, Bot. 3: 267 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:302672-1.
This name was in version 1 of The Plant List, record kew-231616, and has not been changed.