‘JUNE, 1911 | 
e BULLETIN, 
OF THE : . 
€nitor : 
PHILIP DOWELL . 
Associate Editors f 
JouN HENDLEY BARNHART Tracy ELtiot HAZEN oe 
JEAN BROADHURST MARSHALL AVERY Howe > 
Ernest DunBAR CLARK HERBERT MAULE RICHARDS : 
ALEXANDER WILLIAM EVANS NORMAN TAYLOR 
CONTENTS 
' Hepaticae of Puerto Rico—X ( Plates 11 and pele 
EXANDER WILLIAM EVANS : st 2 
List of lichens collected in the Yukon region = Mr. i = William: ae 
. HEBER HOWE, Jr. 287 
= Notes on ¥ Ratacene <¥ Sp oe eae eee “PERCY WILSON 295 
di cies of Spirogyra. . . . . F. M. ANDREWS 299 
INDEX TO AMERICAN BOTANICAL LITERATURE . ee “2 BO 
PUBLISHED FOR THE CLUB 
THE MEW ERA PRINTING COMPANY 
LANCASTER, PAW 
