This name is a synonym of Alsophila firma (Baker) D.S. Conant.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26616727) with original publication details: Bull. Herb. Boissier, sér. 2, 6(3): 180 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:73112-2.
This name was in version 1 of The Plant List, record tro-26616727.