This name is a synonym of Gymnocalycium denudatum subsp. angelae (Mereg.) Prestlé.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kakteen And. Sukk. 49: 287 1998.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:317157-2.
This name was in version 1 of The Plant List, record kew-2835528, and has not been changed.