This name is a synonym of Gymnocalycium calochlorum (Boed.) Y.Itô.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kaktus-ABC 294 1935.
This name was in version 1 of The Plant List, record kew-2835788, and has not been changed.