This name is a synonym of Cyathea nigrescens (Hook.) J. Sm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26621241) with original publication details: Sp. Fil. 1: 17 1846.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:73106-2.
This name was in version 1 of The Plant List, record tro-26621241, and has not been changed.