128 INDEX TO AMERICAN BOTANICAL LITERATURE 
Rose, J. N. Pachyphytum bracteosum. Addisonia 2: 53. pl. 67. 29 
S 1917. 
Russel, P.G. Uses of cacti. Am. Bot. 23: 90-97. Au 1917. 
Sampson, A. W. Important range plants; their life history and 
forage value. U.S. Dept. Agr. Bull. 545: 1-63. pl. 1-56. 8 O 
1917. 
Sawyer, M. L. Pollen tubes and spermatogenesis in Iris. Bot. Gaz. 
64: 159-164. f. 1-18. 15 Au 1917. : 
Sawyer, W. H., Jr.. The development of Cortinarius pholideus. Am. 
Jour. Bot. 4: 520-532. pl. 28, 29. 24 N 1917. 
Seaver, F. J. Sclerotinia and Botrytes. Torreya 17: 163, 164. 20 
1917. 
Also published in Science II. 46: 163. 17 Au 1017. 
Shamel, A.D. Origin of the striped cane. Jour. Heredity 8: 471, 472. 
f. 13. O 1917. | 
Shantz, H. L., & Piemeisel, R. L. Fungus fairy rings of eastern Col- 
orado and their effect on vegetation. Jour. Agr. Research 11: 19I- 
246. pl. 10-30 + f. I-15. 29 O 1917. 
Shear, C. L. Endrot of cranberries. Jour. Agr. Research 11: 35-42. 
pl. A + f. 1-3. -8 O i917: 
Fusicoccum putrefaciens sp. nov. is described, 
Shear, C. L., & Stevens, N. E. The botanical work of Ezra Michener. 
Bull. Torrey Club 44: 547-558. 27 D 1917. 
Shear, C. L., & Stevens, N. E. Studies of the Schweinitz collections of 
fungi-II. Distribution and previous studies of authentic speci- 
mens. Mycologia 9: 333-344. 24 N 1917. 
Sherwood, N. P. A study of several strains of pleomorphic Strepto- 
cocci. Kansas Univ. Sci. Bull. 20: 245-257. Ja 1917. 
Shufeldt, R. W. Marsh land and other aquatic plants. Am. Forest. 
23: 611-618. O 1917. [Illust.] 
Shufeldt, R.W. Necessity of greater accuracy in describing American 
trees. Nature Study Rev. 13: 288-294. f. 1,3. O 1917. 
Shufeldt, R. W. Queen Ann’s lace: the papaw tree, and self-heal. 
Am. Forest. 23: 543-548. f. 1-6 + f. 98-124. S$ 1917, 
Sinnott, E. W. A botanical criterion of the antiquity of the Angio- 
sperms. Jour. Geol. 24: 777-782. D 1916. 
Sinnott, E. W. The ‘‘age and area” hypothesis and the problem of 
endemism. Am, Bot! 31: 209-216. Ap 1917. 
Skan, S. A. Pyrola bracteata. Curt. Bot. Mag. IV. 13: pl. 8710 B. 
Je 1917. : 
A North American plant. 
