CERATOPTERIS. 153 



GENUS IX. 



CERATOPTERIS. Buongniart. 



Only a single species is in cultivation in this country. It 

 is a water Fern, and will thrive well if plunged to the rim 

 of the plant in a tank of water. 



Fronds fragile; the fertile fronds decompound; the segments 

 forked and linear; margins revolute and membranaceous. 



Veins transversely elongated and distantly anastomosing. 



Sori disposed in a simple series, constituting two linear 

 subparallel sori. 



