/ 
BRYOLOGIST 
AN ILLUSTRATED BIMONTHLY 
DEVOTED TO 
NORTH AMERICAN MOSSES 
HEPATICS AND LICHENS 
VOLUME XXI 
O. E. JENNINGS, Ph.D., Editor-in-Chief 
Associate Editors 
GEORGE N. BEST, M.D. JOHN M. HOLZINGER, M.S. 
ALEXANDER W. EVANS, Ph.D. LINCOLN W. RIDDLE, Ph.D. 
and the 
Advisory Board Officers of the Society 
Pittsburgh, Pennsylvania 
1918 
