Gymnocalycium mackieanum (Hook.) Metzing, Mereg. & R.Kiesling in Allionia 33: 209. 1995 Gymnocalycium mackieanum (Hook.) Metzing, Mereg. & R.Kiesling in Allionia 33: 209. 1995is new combination for Echinocactus mackieanus Hook. in Bot. Mag. 64: t. 3561. 1837Taxon for this nameGymnocalycium mackieanum (Hook.) Metzing, Mereg. & R.Kiesling