This name is a synonym of Gymnocalycium hyptiacanthum subsp. uruguayense (Arechav.) Mereg..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Anales Mus. Hist. Nat. Montevideo II, 5(1): 59 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:87783-2.
This name was in version 1 of The Plant List, record kew-2782400, and has not been changed.