CONTENTS. 



PART 1. 



EXPLANATION OF THE NATURE AND STRUCTURE OP THE PARTS OF 



FERNS ON WHICH GENERA ARE FOUNDED AND CLASSIFIED. 



PAGE. 



1. Nature and number of Ferns . 1 



2. Organography. Definitions of the parts of Ferns on which 



genera are founded and classified 8 



3. On the genera of early authors, and their systems of classi- 



fication 20 



4. On the genera of modern authors, and review of their systems 



of classification 25 



5. On the genera and their classification as founded on their 



modes of growth and habit . . . . . .61 



PART 2. 



General arrangement and characters of tribes and genera, with 

 remarks on their relationship one to another, and the 

 number of species 77 to 370 



PART 3. 



1. On the reproduction of Ferns , 371 



2. On the geographical distribution of Ferns . . . .377 



3. On the properties and uses of Ferns . 385 



PART 4. 



1. Names of writers on Ferns, and their works .... 396 



2. Etymology. Derivations of generic names adopted in this 



work 409 



3. Alphabetical list of genera of authors not adopted . , . 422 



4. Index to the tribes and genera adopted in this work . . 427 



