AN ENUMERATION OF CULTIVATED EEKNS. 



109 



Fsr-iionitis citrifolia, Hook. Sp. JM— West Iadicr 

 «wiC Tropical America. 



2. Polybotryce. Vernation generally unisenal, distant or 

 contiguous. Fronds pinnate or bi-tripinnate, rarely flabellate, 

 segments adherent or articulate with the rachis. Veins free or 

 combined at the -margin, or anastomosing in various ways. 



* Veins free. 



t Segments adherent. 



33. RHIPIDOPTERIS, Scholt. 



Vernation uniserial; sarmentum slender, filiform. Fronds 

 distant, 3-6 inches long, the sterile flabdliform, entire, bi-tri- 



Cenus 33.— Fertile and barren fronds. No. 1. 



lobed or dichotomously multifkl. Veins flabellately forked, free. 

 Fertile frond subrotund, entire or bilobed, sporangiferous on the 

 under side. 



