This name is a synonym of Lycopodium clavatum subsp. contiguum (Klotzsch) B. Øllg..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26609040) with original publication details: Linnaea 18: 519 1844.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:280018-2.
This name was in version 1 of The Plant List, record tro-26609040.