Stem not forked. 
Key to Ferns (Filices). 
(a) Simple leaf-like, feather-like parted, or twice parted . 
(^) Feather-like divided 
( c ) Feather-like divided and parted : 
narrow ........ 
less than 2 ft. long ..... 
2 ft. or more long ..... 
(d) Twice feather-like divided . .... 
(e) Twice divided and parted, at least the lower leaflets 
(/) Three times divided, at least the lower leaflets . 
Stem two-forked. Ferns ....... 
Evergreens or Club-mosses ..... 
Plate I. 
Plate II. 
Plate II. 
Plate III. 
Plates IV., V. 
. Plate VI. 
Plates VP, VII., VIII. 
. Plate IX. 
Plate X. 
. Plate XI. 
