This name is a synonym of Gymnocalycium mostii subsp. valnicekianum (Jajó) Mereg. & 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: Gymnofil 28: 2 1999.
This name was in version 1 of The Plant List, record kew-2835787.