2020

Gymnocalycium castellanosii Backbg. ex Piltz var. spinosior Milt var. nova.
Milt, I. (2020): Gymnocalycium castellanosii Backbg. ex Piltz var. spinosior Milt var. nova. - Cactaceae etc. 30(2): p. 46-48.
Holotype: Regional Museum of Olomouc (CZ), inventary number B172329, living plant in collection I. Milt under number 868.
Origin: Argentina, prov. La Rioja, environment of the place Illisca.