. The Cactaceae : descriptions and illustrations of plants of the cactus family. NEOMAMMILLARIA. 99 Mammillaria nivea cristata Salm-Dyck (Walpers, Repert. Bot. 2: 270. 1843) is only a name. M. nivea wendlei Pfeiffer (Labouret, Monogr. Cact. 57. 1853) was given as a synonym of M. hicolor. To this relationship we would refer the plant which has long been known in collections tmder the name of Mammillaria poiosina* and M. potosina var. longisphia. It resembles M. celsiana in the spines, but the tubercles are milky and the stem is more elongated. We have seen the following illustration: Mollers De
. The Cactaceae : descriptions and illustrations of plants of the cactus family. NEOMAMMILLARIA. 99 Mammillaria nivea cristata Salm-Dyck (Walpers, Repert. Bot. 2: 270. 1843) is only a name. M. nivea wendlei Pfeiffer (Labouret, Monogr. Cact. 57. 1853) was given as a synonym of M. hicolor. To this relationship we would refer the plant which has long been known in collections tmder the name of Mammillaria poiosina* and M. potosina var. longisphia. It resembles M. celsiana in the spines, but the tubercles are milky and the stem is more elongated. We have seen the following illustration: Mollers Deutsche Gart. Zeit. 25: 475. f. 8, No. 9, as M. potosina. De Candolle (Prodr. 3: 459. 1828) referred here Cactus columnaris Mocifio and Fig. 96.—Neomammillaria collinsii. Fig. 97.—Neomammillaria gerninisi>ina. Illustrations: Wiener 111. Gart. Zeit. 11: pi. 3, in part, as Mammillaria nohilis; Hort. Beige 4: pi. I, as M. daedalea; Mollers Deutsche Gart. Zeit. 25: 475. f. 8, No. 4, as M. bicolor nobilis; Cact. Joum. i: pi. for March, as M. nivea cristata; Cact. Joum. i: pi. for March, as M. nivea longispina; Pfeiffer and Otto, Abbild. Beschr. Cact. i: pi. 3; De I/aet, Cat. Gen. f. 50, No. 8; Wiener 111. Gart. Zeit. 29: f. 22, No. 8; Knippel, Kakteen pi. 19, as M. hicolor. Plate V, figure 3, shows a flowering plant sent by Carl Ackerman which flowered in the New York Botanical Garden, October 9, 1920; plate viii, figure 5, shows a plant which flowered in the New York Botanical Garden, November 11, 1911. Figure 97 is from a photograph by Ernest Braunton showing a plant grown in southern California. 44. Neomammillaria pyrrhocephala (Scheidweiler). Mammillaria pyrrhnccphala Scheidweiler, Allg. Gartenz. 9: 42. 1841. Mammillaria mallettiana Cels, Portef. Hort. 2: 222. Mammillaria senckei\ Forster, Handb. Cact. 227. 1846. Mammillaria pyrrhocephala dotikelaeri Sa.\m-T)yck, Cact. Hort. Dyck. 1849. 17, 121. 1850. Cactus pyrrhocephalus Kuntze, Rev. Gen. PI. i: 261. 1891. Cylind
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