This name is a synonym of Gymnocalycium castellanosii Backeb..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kaktusy (Brno) 13: 124 1977.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:115360-2.
This name was in version 1 of The Plant List, record kew-2835551.