CONTENTS 



PAGE 



Preface v 



List of Illustrations ix 



Introduction. By William Trelease i 



Fungi. By P. A. Saccardo and William Trelease ii 



Lichens. By Clara E. Cummings 65 



Alg^. By De Alton Saunders 153 



Mosses. By J. Cardot and I. Th^riot 251 



Sphagnums. By William Trelease 329 



Liverworts (Hepatic^). By Alexander W. Evans 339 



Ferns and Fern Allies (Pteridophytes). By William 



Trelease 373 



Index 399 



ivii) 



