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CRYPTOGAMOUS PLANTS. 



Order 108.— EQUISETACEiE. (Horse-tail Family.) 



Equisetum, L. 



arvense, L. (Scouring Rush.) 

 rob us turn, Braun. 



Order 109.— FILICES. (Fern Family.) 



Polypodium, L. 



hexagonopterum, Michx. 

 Pteris, L. 



aquilina, L. (Brake.) 

 Adiantum, L. 



pedatum, L. (Maiden-hair.) 

 Camptosorus, Link. 



rhizophyllus, Link. (Walking Leaf.) 

 Asplenium, L. 



ebeneum, Ait. 



angustifolium, Michx. 



thelypteroides, Michx. 



Felix-foemina, R. Br. 

 Cystopteris, Bernh. 



fragilis, Bernh. 

 Dryopteris, Adas. 



Novebracensis, Gray. 



Thelypteris, Gray. 



Goldiana, Gray. 



POLYSTICHUM, Roth. 



acrostichoides, Schott. 

 Onoclea, L. 



sensibilis, L. 



OsMUNDA, L. 



spectabilis, Willd. 

 Claytoniana, L. 



