J'- 
Vol. VI. 
JANUARY, 1919 
No. 1 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Biologic specialization in the genus Septoria. . . .Walter Spurgeon Beach 1 
A consideration of certain pathologic conditions in Ambrosia trifida. 
Alban Stewart 34 
PUBLISHED 
IN CX)OPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-class matter February 21, 1914, at the post office at Lancaster, Pennsylvania, 
under the act of March 3,1 879 
