38 



The Fern Lover's Companion 



Indusiuiii cor- 

 date, fixed bj' 

 the sinus. Wood 

 Ferns. Aspi- 



(Uiim. 



Indusiuni hood-shaped, fixed 

 centrally behind the sorus and 

 arching over it, soon wither- 

 ing, often illusive. Fronds two 

 to three pinnate, very grace- 

 ful. Moisture-loving species. 

 Bladder Ferns. Cysfopferis. 



Indusiuni star-shaped, of a few 

 irregular segments fixed beneath 

 the .sorus, often ob.scure. Mostly 

 small, rock-lo^-ing plants, usually 

 rather chaffy, at least at the base, 

 and growing in tufts. Woodsia. 



