AN ENUMERATION OF CULTIVATED FEKNS. 



109 



Hemionitis citrifolia, Hook. Sp. Fit. West Indies 

 and Tropical America. 



2. Polybotryce. Vernation generally uniserial, distant or 

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

 segments adherent or articulate with the rachis. Veins free or 

 combined at the margin, or anastomosing in various ways. 



f Segments adherent. 

 33. RHIPIDOPTEEIS, Schott. 



Vernation uniserial; sarmentnm slender, filiform. Fronds 

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



Genus 33. Fertile and barren fronds. No. l. 



lobed or dichotomously multifid. Veins flabellately forked, free. 

 Fertile frond subrotund, entire or bilobed, sporangiferous on the 

 under side. 



