AN ENUMERATION 01? CULTIVATED FEKNS. 99 



26. NIPHOBOLTJS, Eaulf. ; J. 8m. 



Rhizome short ov elongated and surculose. Fronds simple, 

 linear-lanceolate, oblong-elliptical, or obovate-subrotund, rarely 

 lobed, from less than an inch to three or four feet long, thick 

 and fleshy or coriaceous, covered with sessile or stipulate stellate 

 pubescence; the fertile usually more or less contracted and 



Genus 26.— Poition of rhizome,with a barren frond. No. a. 



longer than the sterile. Veins obscure, undefined, or evident 

 and costseform ; venules compound anastomosing. Receptacles 

 punctiform, immersed, terminal or medial on simple or brachi- 

 ate free veinlets, or compital. Sori round or oval, sub-trans- 

 verse multiserial between the primary veins, or irregular and 

 confluent, protruding through the dense stellate pubescence. 

 H 2 



