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 26613833) with original publication details: Contr. Gray Herb. 200: 20 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241961-2.
This name was in version 1 of The Plant List, record tro-26613833, and has not been changed.