This name is a synonym of Cyathea costularis Bonap..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50047126) with original publication details: Contr. Gray Herb. 200: 31 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17531250-1.
This name was in version 1 of The Plant List, record tro-50047126, and has not been changed.