CONTENTS 
PAGE 
Preface.. .... ..... v 
List of Illustrations ...... ix 
Introduction. By William Trelease. i 
Fungi. By P. A. Saccardo and William Trelease... 11 
Lichens. By Clara E. Cummings. 63 
Algje. By De Alton Saunders... 153 
Mosses. By J. Cardot and I. Theriot..... 251 
Sphagnums. By William Trelease....... 329 
Liverworts (Hepatic^e). By Alexander W. Evans... 339 
Ferns and Fern Allies (Pteridophytes). By William 
Trelease. 373 
Index. 399 
1 vii ) 
