Mammillaria bicolor f. cristata (Salm-Dyck) Schelle, Handb. Kakteenkult.: 263. 1907 Mammillaria bicolor f. cristata (Salm-Dyck) Schelle, Handb. Kakteenkult.: 263. 1907is new combination for Mammillaria bicolor var. cristata Salm-Dyck, Cact. Hort. Dyck., ed. 1849: 9. 1850Taxon for this nameMammillaria bicolor f. cristata (Salm-Dyck) Schelle