This name is a synonym of Cyrtomium falcatum f. acutidens (Christ) C. Chr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50069199) with original publication details: Bot. Mag. (Tokyo) 39(461): 114 1925.
This name was in version 1 of The Plant List, record tro-50069199.