Gymnocalycium fischeri
Gymnocalycium fischeri in Acta Mus. Richnov., Sect. Nat., 9: 60. 2002 sec. Metzing 20211
- 1. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. http://doi.org/10.3372/wi.51.51208
- =Gymnocalycium miltii in Acta Mus. Richnov., Sect. Nat., 9: 64. 2002 syn. sec. Metzing 20212
- 2. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. http://doi.org/10.3372/wi.51.51208
- =Gymnocalycium fischeri subsp. suyuquense in Gymnocalycium 16: 539. 2003 syn. sec. Charles 20093