This name is a synonym of Alsophila thomsonii (Baker) R.M. Tryon.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26616177) with original publication details: J. Bot. 19: 180 1881.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17074540-1.
This name was in version 1 of The Plant List, record tro-26616177, and has not been changed.