Ariocarpus disciformis (DC.) W.T.Marshall in Cact. Succ. J. (Los Angeles) 18: 56. 1946 Ariocarpus disciformis (DC.) W.T.Marshall in Cact. Succ. J. (Los Angeles) 18: 56. 1946is new combination for Mammillaria disciformis DC. in Mém. Mus. Hist. Nat. 17: 114. 1828Taxon for this nameAriocarpus disciformis (DC.) W.T.Marshall