This name is a synonym of Carex nubigena subsp. albata (Boott ex Franch. & Sav.) T.Koyama.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 224352) with original publication details: Enum. Pl. Jap. 2: 553 1878.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1016122-1.
This name was in version 1 of The Plant List, record kew-224352.