This name is a synonym of Cyathea marginalis (Klotzsch) Domin.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26613832) with original publication details: Linnaea 18: 542 1844.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:10029-2.
This name was in version 1 of The Plant List, record tro-26613832, and has not been changed.