Vol. IV. 
JUNE, 1917 
No. 6 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The taxonomy of the Agaricaceae....... , William A. Murrill 315 
Observations on forest tree rusts. 
James R. Weir and Ernest E. Hubert 327 
Endothia pigments. I... Lon A. Hawkins and Neil E, Stevens 336 
Observations on an Achlya lacking sexual reproduction.-.. Wm. H. Weston 354 
The Fritillaria rusts of Europe and America.....—... Charles C. Rees 368 
PUBLISHED 
IN COOPERATION 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, 1879. 
