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 453004) with original publication details: Acta Phytotax. Geobot. 16: 10 1955.
This name was in version 1 of The Plant List, record kew-453004, and has not been changed.