This name is a synonym of Cyathea brunnescens (Barrington) R.C. Moran.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26615391) with original publication details: Amer. Fern J. 77(3): 101 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:275495-2.
This name was in version 1 of The Plant List, record tro-26615391, and has not been changed.