This name is a synonym of Magnolia macklottii var. beccariana (A.Agostini) Noot..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117705) with original publication details: J. Asiat. Soc. Bengal 58(2): 369 1889.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554767-1.
This name was in version 1 of The Plant List, record kew-117705, and has not been changed.