This name is a synonym of Gymnocalycium castellanosii subsp. ferocior (Backeb. ex H.Till & Amerh.) G.J.Charles.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Gymnocalycium 15: 435 2002.
This name was in version 1 of The Plant List, record kew-2835725, and has not been changed.