116 THE CACTACEAE. 
Dr. Rose collected living specimens from the type locality some years ago but these 
never flowered. In April 1921 we sent Dr. Reiche to the type locality and he obtained 
thirteen beautiful specimens, one of which was in fruit. 
Coulter (Contr. U. S. Nat. Herb. 3: 109. 1894) states that Cactus pringlet was near 
Cactus rhodanthus sulphureospinus, which was based on M. sulphurea Forster. 
Figure 121 is from a photograph of the plants collected at Tultenango Canyon in 1921. 
73. Neomammillaria cerralboa sp. nov. poor ene — 
Cylindric, solitary, 1 to 1.5 dm. high, 5 to 6 cm. in diameter; 
tubercles not milky, yellowish, terete, obtuse, closely set; spines 
all yellow, very much alike, about 11, one usually more central, 
the longer ones nearly 2 cm. long; flowers small, 1 cm. long or 
less, forming a circle around the plant about 3 cm. below the top. 
Collected by Ivan M. Johnston on Cerralbo Island, 
Gulf of California, June 6, 1921 (No. 4038). The next day 
on the same island he collected three more plants (No. 
4053) which seem to be referable here, except that two of 
them have hooked spines; Dr. Rose also collected on this 
same island (No. 16877) in 1911 specimens with hooked 
spines which are like Mr. Johnston’s plant. Whether this 
plant has normally these two forms or whether the hooked- 
spined one is a hybrid we are unable to determine. 
Figure 121a is a photograph of the type plant, col- 
lected by Johnston (No. 4038). 
7 74. Neomammillaria phaeacantha (Lemaire). 
Mammillaria phaeacantha Lemaire, Cact. Gen. Nov. Sp. 47. 
1839. Fic. 121a. Neomammnillaria cerralboa. 
Mammillaria nigricans Fennel, Allg. Gartenz. 15:66. 1847. 
Cactus nigricans Kuntze, Rev. Gen. Pl. 1: 261. 1891. Not Haworth, 1803. 
Cactus phaeacanthus Kuntze, Rev. Gen. Pl. 1: 261. 1891. 
Fic. 122.—Neom: illari: aeac: ; 4 . . ‘ 
Neomammnillaria phaeacantha. Fic. 123.—Neomammillaria graessneriana. 
Globose or somewhat depressed, green; axils of tubercles woolly; tubercles conic, hardly, if at 
all, angled; spine-areoles small, yellowish tomentose (probably so only when young); radial spines 
