348 



FILICES. 



[chap. 



Lindscea (ensifolia). — Sori continuous along the margin of 

 the segments, with a narrow continuous indusium opening 

 on the outer edge. 



Davallia {Jiolypodioides). — Sori terminating veins, nearly 

 or quite on the margin of the pinnules. Indusium cup- 



FiG. 230. Pinnule of Nepkrodium. 



shaped, adhering to the pinnule and opening towards the 

 margin. 



Cyathea {spinulosa). — Arborescent; sporanges forming 

 globose sori in the axils of forking veins, contained in a 

 cup-shaped indusium, which opens at the top by a few 

 teeth. 



Fig. 231. Pinnule and sorus of Cyathea. 



Alsophila {glabra). — Arborescent, sometimes fifty feet 

 high. Sori globose, without an indusium. 



