This name is a synonym of Adiantum macrocladum Klotzsch.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26606771) with original publication details: Univ. Calif. Publ. Bot. 19(9): 303, t. 61 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:4987-2.
This name was in version 1 of The Plant List, record tro-26606771, and has not been changed.