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. Nac. Montevideo 5: 218 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:87782-2.
This name was in version 1 of The Plant List, record kew-2782399, and has not been changed.