—114 — 



or moist places ; stem usually creeping. Lycopo- 

 diales. 



Order 6. — Spores of two sizes in the axils of quill- 

 like leaves. Water plants, nearly stemless, with leaves 

 in rosettes. Isoetales. 



The Classes, Orders, Families axd Gexera of 

 the pteridophyta. 



(According to Relationships.) 



CLASS FILICINEiE. 

 Order Ophioglossales. 

 Family Ophioglossaceae. 



Genera: Botrychium, Ophioglossum. 

 Order Filicales. 

 Family Osmundacese. 



Genus : Osmundct. 

 Family Schizseaceae. 



Genera: Ancimia, Lygodium , Schhcca. 

 Family Hymenophyllacese. 



Genus : Tvichomancs. 

 Family Parkeriacese. 



Genus : Ccratoptcris. 

 Family Polypodiacese. 



Genera: Acrostichum, Adiantum, Aspidium, 

 Asplenium, Athyrhun, Blechnum, Camptosorus, 

 Chcilanthcs, Crypto gramma, Cystopteris, Da- 

 vallia, Dicksonia, Gymno gramma, Lomaria, 

 Meniscium, N ephrodium, Nephrolepis, Notho- 

 Iccna, Onoclca, Pellcea, Phegopteris, Polypo- 

 diam, Polystichum, Ptcris, Scolopendrhim , 

 Struthiopteris, Ta-nitis, Vittarla, JVoodsia, 

 Woodzvardia. 

 Order Salvixiales. 

 Family Salviniacese. 



Genera: Azolla, Salvinia. 

 Family Marsiliaceae. 



Genera: MarsiUa, Pilularia. 



