Vol. VII MAY, 1920 No. 5 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
JUN 18 1920 
William Gilson Farlow, December 17, 1844-June 3, igig 
A. F. Blakeslee, Roland Thaxter, and William Trelease 173 
The development of the thallus of Sphaerocarpos Donnellii Aust. 
H. W. RiCKETT 182 
The genus Plantago in Hawaii Joseph F. Rock 195 
Relation of catalase, oxidase, and H+ concentration to the formation of over- 
growths , R. B. Harvey 211 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
At 41 North Queen Street, Lancaster, Pa. 
BY THE . 
BROOKLYN BOTANIC GARDEN 
Brooklyn, N. Y. 
Entered as second-class matter February 21, 1914, at the post office at Lancaster, Pennaylraiiia, 
under the act of March 3, 1879 
