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 50055659) with original publication details: Sp. Fil. 3: 48, t. 158 1860.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17058880-1.
This name was in version 1 of The Plant List, record tro-50055659.