This name is a synonym of Diplazium altissimum (Jenman) C. Chr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26623490) with original publication details: Mem. New York Bot. Gard. 46: 154, f. 96J,K 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:275930-2.
This name was in version 1 of The Plant List, record tro-26623490, and has not been changed.