KEY TO THE GENERA 



Woodsia. 



PAGE 



Fruit dots roundish^ indusium 

 fixed beneath the sorus and 

 enclosing it when young, 

 bursting at the top into sev- 

 eral irregular segments, 

 soon withering; rock spe- 

 cies. 



Woodsia. 142 



Dicksonia. 



Fruit dots small, globular, 

 borne on reflexed toothlets 

 of the pinnules ; indusium 

 cup-shaped, fixed beneath 

 the sorus, open at the top; 

 fronds finely cut. Hay- 

 scented Fern. 



Dicksonia. 158 



Fruit dots long and narrow, 

 almost at right angles to 

 the midrib, borne in pairs 

 between two veins, opening 

 along the middle; blade 

 long, undivided. Hart's 

 Tongue. 



SCOLOPENDRIUM. l62 



Scolopendrium. 



