ONOCLEA. 



GENUS I. 



ONOCLEA. LiNN^us. 



Barren and fertile fronds different. The fertile fronds being 

 contracted, the segments rugose, sessile, bacciform, somewhat 

 oblong; margin conniving, fimbriate, and membranous, forming 

 a universal indusium. 



Sori circular, confluent; each segment consisting of from four 

 to eight. Spore-cases medial, with concrete pedicels. Special 

 indusium very membranous, lateral and cucullate. Fronds pin- 

 nate and bipinnate; length from one to two feet. 



Khizoma creeping. 



Fertile veins simple, direct, and free. Sterile veins reticulated. 



The pinnules of the fertile fronds roll up so as to completely 

 hide the sori. 



Two species alone are described, and only one is in cultivation, 

 although both have been said to be introduced. 



The name is derived from the Greek, and refers to the 

 manner of the folding-up of the fertile segments. 



