KEY TO THE OEXERA 



This key, in illustratint;' each j^emis, follows the method 

 of Chite in "Our Ferns in Tlieir Haunts." hut sulistitutes 

 otlier antl larger s])eeiniens. Five of these are fi-oni 

 AVaters" "Ferns" hy jierniission of Henry Holt & Co. 



As the indusiuni, wliicli often determines the name of a 

 fern, is ai)t in some species to wither early, it is im])ortant 

 to secure for study not only a fertile frond, hut one in as 

 good condition as possilile. Vov convenience the ferns 

 mav he considered in two classes. 



2.9 



