Vol III. 
JUNE, 1916 
ITo. 6 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The archegonium and sporophyte of Treubia insignis Goebel. 
Douglas Houghton Campbell 261 
The orientation of primary terrestrial roots with particular reference to the 
medium in which they are grown , . . ....... Richard M. Holman 274 
A study of development in the genus Cortinarius . . Gertrude E. Douglas 319 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as s 
econd-cl 
ass matter February 21, 1914, at the post office at Lancaster, Pennsylvania, 
linder the act of March 3, 1879. 
