This name is a synonym of Carex macloviana subsp. subfusca (W.Boott) T.Koyama.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 231298) with original publication details: Bot. California 2: 234 1880.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:310203-2.
This name was in version 1 of The Plant List, record kew-231298, and has not been changed.