Polypodiaceae 



Sporanges at or near the ends of the unconnected 



veins. 



Leaves of two kinds, the spore-bearing ones con- 

 tracted and more or less pod-like. 



Cryptogramma. 



Leaves uniform; sori minute, indusium usually 

 interrupted. Cheilanthes. 



Sori not marginal, provided with spinal indusia. 

 Sori oblong on oblique veins; leaves pinnate. 



Asplenium. 

 Sori round. 



Indusium conspicuous. 



Leaves firm ; indusium peltate. Polystichum. 

 Leaves membranous; indusium reniform. 



Dryopteris. 

 Indusium inconspicuous. 



Indusium under the sorus, stellately divided. 



Woodsia. 

 Indusium hooded, fixed by a broad base. Filix. 



,,, Rootstock short, thick, erect or 



Fnegopteris 



alpestris oblique; stems 4-10 inches long 



(Hoppe) with a few brown spreading 



Mett - scales near the base; leaves 1-2 



Western f , 



Beech Fern. feet long ' oblong-lanceolate, 

 thrice pinnate, the pinnae del- 

 toid-lanceolate, the lower ones distant 

 and smaller, pinnules oblong-lanceolate, 

 finely cut-toothed; sori small, rounded 

 and nearly marginal. 



