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 226503) with original publication details: Enum. Pl. Jap. 2: 564 1878.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:299727-1.
This name was in version 1 of The Plant List, record kew-226503, and has not been changed.