Phellosperma tetrancistra (Engelm.) Britton & Rose, Cactaceae 4: 60. 1923 Phellosperma tetrancistra (Engelm.) Britton & Rose, Cactaceae 4: 60. 1923is new combination for Mammillaria tetrancistra Engelm. in Amer. J. Sci. Arts, ser. 2, 14(42): 337–338. 1852Taxon for this namePhellosperma tetrancistra (Engelm.) Britton & Rose