145 



GENUS III. 



HEMIDICTYUM. Presl. 



A GENUS represented by a solitary species, the Hemidictyum 

 marginatum of Presl. A large handsome Fern. 



Pinnate fronds, forked veins, parallel venules, except near 

 the margin of the pinnae, where they anastomose, and are re- 

 ticulated, and are combined by a transverse continuous marginal 

 vein. 



Sori unilateral and linear. 



Indusium plane. 



VOL. V. 2 1) 



