INDEX TO AMERICAN BOTANICAL LITERATURE 309 
Shear, C. L. Frederik Georg Emil oe Phytopathology 
12: 1-3. With portrait. 10 Mr 1922 
Shull, G. H. Three new mutations in Oenothera Lamarckiana. 
Jour. Hered. 12: 354-363. f. 8-16. O 1921, 
Sinnott, E. W., & Blakeslee, A. F. Structural changes asso- 
ciated with factor mutations and with chromosome, muta- 
tions in Datura. Proc. Nat. Acad. Sci. 8:17-19. 15 F 1922. 
Sismey, E.D. A contribution to the algal flora of the Ojanagan 
[British Columbia]. Canad. Field Nat. 35: 112-114. 3 
F 1922. 
Small, J. K. Historic trails, by land and by water. Jour. New 
York Bot. Gard. 22: 193-222. pl. 263-266. D 1921. 
Record of exploration in Florida in Dec. 1919. 
Small, J. K. Wild pumpkins. Jour. New York Bot. Gard. 
23: 19-23. 1922. 
Smiley, F. J., & others. Weeds of California and methods of 
control. Monthly Bull. Dept. Agr. of California Mo. Bull. 
11: 1-22, 1-360. f. 1-738. F-—Mr 10922. 
Spaulding, P. Investigations of the white pine blister-rust. 
U. S. Dept. Agr. Bull. 957: 1-100. f. 1-13. 6 F 1922. 
Stephenson, H. T. Trees in winter. Am. For. 28: 79-84. F 
1922. [Illust.] 
Sterrett, W. D. A new oak from the Gulf States. Jour. Elisha 
Mitchell Sci. Soc. 37: 178, 179. Mr 1922 
Quercus ashet sp. nov. 
Stout, A. B. Cyclic manifestation of sterility in Brassica peki- 
nensis and B. chinensis. Bot. Gaz. 73: 110-132. f. I-7. 15 
F 1922 
Sutherland, J. American trees in Scotland. Jour. For. 20: 71- 
74. Ja 1922 
Sydow, H. Novae fungorum species—XVII. Ann. Mycol. 19: 
304-309. 1921. 
des new American species in Cryotosphaeria (1), Gibbera (1), and 
Phaeocibosia (1). 
