This name is a synonym of Gymnosphaera hornei (Baker) Copel..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50179151) with original publication details: Bernice P. Bishop Mus. Bull. 59: 38 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17315880-1.
This name was in version 1 of The Plant List, record tro-50179151, and has not been changed.