DICTY0X1PHIUM. 191 



Having sporangiferous receptacles combined, forming a linear, 

 continuous, or interrupted marginal sorus. 



GENUS I. 



DICTYOXIPHIUM. Hooker. 



Represented by a solitary species, tbe Dictyoxiphium Pa- 

 namense. 



Fronds ensiform, simple, the fertile ones contracted. Sori 

 linear and continuous, forming a marginal belt on either edge 

 of the frond. Veins compoundly-anastomosing, and internal. 



The habit and general appearance of the plant (excepting as 

 regards the sori) not unlike Polypodium irioides. 



