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CLASS EQUISETIXEJE. 

 Order Eouisetales. 

 Family Equisetaceae. 

 Genus: Equisetwn. 



CLASS LYCOPODIXE^E. 

 Order Lycopodiales. 

 Family : Lycopodiacese. 



Genus: Lycopodium. 

 Family Psilotaceae. 



Genus : Psilotum. 

 Family Selaginellace?e. 

 Genus : Selaginella. 



CLASS ISOETINE^E, 

 Order Isoetales. 

 Family Isoetacea?. 

 Genus : Isoctcs. 



The Tribes and Genera of the Polypodiace;e. 



Tribe i. Woodsie.e. — Sori dorsal, round or oblong; 

 indusium inferior. 

 Genus : Wood si a. 



Tribe 2. Davallie^e. — Sori marginal or median, 

 round or transversely oblong ; indusium interior, the 

 margin of the frond often forming a second 

 indusium. 



Genera : Cystopteris, Davallia, Dicksonia. 



Tribe 3. Adiante.e. — Sori marginal, linear, oblong, 

 reniform or roundish ; inserted on the inner side of 

 the reflexed papery margin of the frond. 

 Genus : Adiantum. 



Tribe 4. Pteride^e. — Sori marginal, linear or short 

 oblong ; indusium exterior, of the same shape as the 

 sorus. 



Genera: Chcilanthcs, Crypto gramma, Hypolepis, 

 Notholccna, Pcllcca, Ptcris. 



