Mammillaria pycnacantha Mart. in Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 16(1): 325–326. 1832
Mammillaria pycnacantha in Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 16(1): 325–326. 1832
is basionym for Coryphantha pycnacantha, Cactées: 35. 1868
Lectotype (designated by Hunt, D.R. 20011): [icon] illustration in Martius in Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 16(1): t. 17. 1832 https://www.biodiversitylibrary.org/page/38634284