This name is a synonym of Diphasiastrum madeirense (J.H. Wilce) Holub.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26609530) with original publication details: Feddes Repert. Spec. Nov. Regni Veg. 66: 235 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17435340-1.
This name was in version 1 of The Plant List, record tro-26609530, and has not been changed.