This name is a synonym of Ophioglossum vulgatum f. lanceolatum (Clute) S.F. Blake.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50089704) with original publication details: Fern Bull. 19: 72 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:174626-2.
This name was in version 1 of The Plant List, record tro-50089704, and has not been changed.