TABLE OF CONTENTS. xl 



CHAPTER XX. 



PAGE 



FUNGI CONTINUED (" Rusts " Uredineae) 187 



CHAPTER XXI. 

 THE HIGHER FUNGI 195 



CHAPTER XXII. 

 CLASSIFICATION OF THE FUNGI 213 



CHAPTER XXIII. 



LIVERWORTS (Hepaticae) 222 



Riccia, 222. Marchantia 226 



CHAPTER XXIV. 



LIVERWORTS CONTINUED. 231 



Sporogonium of Marchantia 231 



Leafy-stemmed Livenvorts 236 



The Horned Liverworts 240 



Classification of the Liverworts 242 



CHAPTER XXV. 



MOSSES (Musci) 243 



Classification of Mosses 248 



CHAPTER XXVI. 

 FERNS 251 



CHAPTER XXVII. 



FERNS CONTINUED 262 



Gametophyte of Ferns 262 



Sporophyte 268 



CHAPTER XXVIII. 

 DIMORPHISM OF FERNS 273 



CHAPTER XXIX. 

 HORSETAILS 280 



CHAPTER XXX. 

 CLUB-MOSSES. 284 



CHAPTER XXXI. 

 QUILL WORTS (Isoetes) 289 



