CONTENTS. 



List of Illustrations 



Preface 



The Fern Allies ... . . . 



Key to the Families of Fern Allies 



The Equisetace,!' : Scourini.i-Rushes and 



Horsetails . 

 Key to the Species of Equisetum 

 The Evergreen Equisetums, ur Schl-ring 



Rushes . . , . 



The Deciduous Equisetums, or Horsetails 

 The Lycoi'odiace.e, or Club-Mosses. 

 Key to the Lycopodiums .... 

 The Trailing Lycopodiums 

 The Erect or Decumbent Lycopodiums . 



The Psilotace_e 



The Selaginellace.-e, or Dwarf Club-AIosses 

 Key to the Selaginellas .... 

 Tlie True Selaginellas, or Selagini;lla Ru 



PESTRis Group 

 TiiE Creeping Selaginella Group 

 The Salviniace.e .... 

 Salyinia 



TliE AZOIT.AS 



The Marsiliace.e, or PEPPER^voRTS 



Key TO THE Marsilias 



The Marsilias .... 



Vll 



xi 

 I 

 8 



9 

 i6 



17 

 41 

 69 



77 



79 



105 



TOO 



^ -o 



129 

 135 



137 



153 

 167 



173 

 179 

 185 

 191 

 193 



