THE BRYOLOGIST 



AN ILLUSTRATED BIMONTHLY 



DEVOTED TO 



NORTH AMERICAN MOSSES 



HEPATICS AND LICHENS 



Volume XX 



O. E. JENNINGS, Ph.D., Editor-in-Chief 



Associate Editors 

 ABEL JOEL GROUT, Ph.D. 

 GEORGE'vN. 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 

 1917 ^nstTi^ 



^ MAR 1 ^ ^918 % 



