NKOMAMMILLARIA . 



113 



According to Salm-Dyck, Mammillaria celsiana differs from M. rutila in its columnar 

 stem and in its spines. 



Schumann refers Mammillaria perringii to M. celsiana, while Hildmann claims that it 

 is possible that the two may be distinct, but we do not have the material at hand to 

 decide definitely. 



Mammillaria lanifera Haworth (Phil. Mag. 63: 41. 1824; CacUis lanifer Kuntze, 

 Rev. Gen. PI. i: 260. 1891) is referred here by Schumann; it is probably different but, if 

 not, the name has priority over M. celsiana. To M. lanifera De Candolle (Prodr. 3: 459. 

 1828) refers Cactus canescens Mociiio and Sesse. M. geminispina monacantha Lemaire 

 (Cact. Gen. Nov. Sp. 100. 1839) was supposed to be the same as M. lanifera. Adammillaria 

 polycephala Miihlenpfordt (Allg. Gartenz. 13: 347. 1845; Cactus polycephalus Kuntze, Rev. 

 Gen. PI. 1 : 261. 1891) was referred by Schumann to M. elegans, but it was described with 

 4 central spines. It seems to be related to M. crucigera, which we have tentatively referred 

 to M. celsiana, which has yellow central spines, while both M. polycephala and M. elegans 

 have white centrals. 



Figs. 117 and 118. — Neomammillaria aureiceps. 



Mammillaria supertexta dichotoma (Salm-Dyck, Cact. Hort. Dyck. 1849. 9. 1850) is 

 based on M. polycephala. 



Mammillaria crucigera Martins (Nov. Act. Nat. Cur. 16: 340. pi. 25, f. 2. 1832; Cactus 

 cruciger Kuntze, Rev. Gen. PI. i: 260. 1891) is related to this species, judging from the 

 description, but the illustration suggests that it is a distinct species. It was collected by 

 Karwinsky in Mexico, but he does not give a definite locality. It was unknown to 

 Schumann. 



Illustrations: Gartenwelt 10: 250; Mollers Deutsche Gart. Zeit. 25: 475. f. 8, No. 29, 

 as Mammillaria celsiana; Gartenwelt 10: 250, as Mammillaria perringii; ?Mem. Mus. Hist. 

 Nat. Paris 17: pi. 4, as Mammillaria lanifera; PMartius, Nov. Act. Nat. Cur. 16: pi. 25, f. 

 2, as Mammillaria crucigera. 



Plate XII, figure 6, shows a plant in the New York Botanical Garden which flowered 

 October 16, 191 1. Figure 116 is from a photograph of two plants sent by Professor Con- 

 zatti in 1920. 



