This name is a synonym of Cnemidaria ewanii (Alston) R.M. Tryon.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26601889) with original publication details: J. Wash. Acad. Sci. 48: 231 1958.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:73199-2.
This name was in version 1 of The Plant List, record tro-26601889, and has not been changed.