Mammillaria longimamma f. hexacentra (Otto) Schelle, Handb. Kakteenkult.: 245. 1907 Mammillaria longimamma f. hexacentra (Otto) Schelle, Handb. Kakteenkult.: 245. 1907is new combination for Mammillaria hexacentra Otto, Handb. Cacteenk.: 183. 1846Taxon for this nameMammillaria longimamma f. hexacentra (Otto) Schelle