206 INDEX TO AMERICAN BOTANICAL LITERATURE 
Potter, A. A. The control of experimental conditions in phytopatho- 
logical research. Phytopathology 6: 81-88. 9 F 1916. 
Robinson, B. L. New, reclassified, or otherwise noteworthy Spermato- 
phytes. Proc. Am. Acad. Arts & Sci. 51: 527-540. Ja 1916. 
New species in Eupatorium (5), Brickellia (1), Verbesina (1), and Liabum (x). 
Rose, J. N. Recent explorations in the cactus deserts of South 
America. Proc. Nat. Acad. Sci. 2: 73, 74. F 1916. 
Rosenbaum, J. Disease of ginseng. Cornell Agr. Exp. Sta. Bull. 363: 
65-106. f. 7-18. O 1915. 
Rothlin, E. Contribucién al estudio de la resina de molle. Trab. Inst. 
Farm. Fac. Cien. Méd. Buenos Aires 26: 1-21. I912. 
Saunders, C.F. The tecate cypress. Bull. S. Calif. Acad. Sci. 15: 
18-21. Ja 1916. [Illust.] 
Schaffner, J. H. Additions to the catalog of Ohio vascular plants for 
1915. Ohio Jour. Sci. 16: 104. Ja 1916. : 
Sears, P. B. Evaporation and plant zones in the Cedar Point marsh. 
Ohio Jour. Sci. 16: 91-100. Ja 1916. _ [Illust.] 
Shamel, A. D. Bud variation. Jour. Heredity 7: 82-87. f. 8. 25 Ja 
1916, 
Shear, C. L., & Stevens, N. E. The discovery of the chestnut-blight 
parasite (Endothia parasitica) and other chestnut fungi in Japan. 
Science II. 43: 173-176. 4 F 1916. 
Smith, J. R. The Persian walnut. Jour. Heredity 7: 55-60. L & 
25 Ja 1916. 
Spoehr, H. A. The theories of photosynthesis in the light of some new 
facts. Plant World 19: 1-16. Ja 1916. 
Standley, P.C. Studies of tropical American phanerogams. Contr. 
U.S. Nat. Herb. 18: 87-142. i-x. 11 F 1916 
New species in Cyperaceae (2), Amaranthaceae (15), Allioniaceae (3); Caesal- 
piniaceae (4), Mimosaceae (3), Fabaceae (6), Geraniaceae (2), Rubiaceae (18), ssa 
26 in various other families and the new geneta Wercklea, Peltaea, and Lopimta. 
Stewart, A. Notes on the anatomy of Peridermium galls. Am. Jour. 
Bot. 3: 12-22. pl. r+f. 1. 5 F 1916. 
Stewart, V. B. The leaf blotch disease of horse-chestnut. Phyto 
pathology 6: 5-19. pl. 2-4+f. 1. 9 F 1915. 
Stone, W. Charles Sumner Williamson. Bartonia 7: 1-5. 1 O 1915: 
[Portrait.] 
Trowbridge, C. C. The thermometric movements of tree branches 
freezing temperatures. Bull. Torrey Club 43: 29-56. f- 1-77 
15 F 1916, 
