This name is a synonym of Pteridium aquilinum var. latiusculum (Desv.) Underw. ex A. Heller.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26619448) with original publication details: Bot. Mag. (Tokyo) 39(461): 106–107 1925.
This name was in version 1 of The Plant List, record tro-26619448.