This name is a synonym of Diplacrum exiguum (J.Kern) T.Koyama.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 265340) with original publication details: Adansonia n.s., 2: 109 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:314703-1.
This name was in version 1 of The Plant List, record kew-265340, and has not been changed.