Vol IX. 
NOVEMBER, 1922 
No. 9 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The structure of the starch griain ....... O. L. Sponsler 471 
A study of the white heart-rot of locust, caused by Trametes 
robiniophila . . . . . . . , . C. H. Kauffman and H. M. Kerber 493 
The origin and development of lamellae in Agaricus campestris 
and in certain species of Coprinus , r'rMTe«AEL Levine 509 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At Prince and Lemon Sts., Lancaster, Pa. 
london agents 
WHELDON AND WESLEY, Ltd. 
2, 3, & 4 Arthur St., London, W. C. 2 
Euicred M scoond-claM maitar February ai, 19x4. at th« post oific«at Lancaster, Pctmaylvania, 
under the act of March 3, 1179 
