This name is a synonym of Blechnum eburneum Christ.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26625820) with original publication details: Acta Phytotax. Geobot. 9(2): 88 1940.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17418850-1.
This name was in version 1 of The Plant List, record tro-26625820.