This name is a synonym of Blechnum gracile Kaulf..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26624574) with original publication details: Univ. Calif. Publ. Bot. 19(9): 288, t. 38 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:33710-2.
This name was in version 1 of The Plant List, record tro-26624574.