AN ENUMEEATION OF CULTIVATED PIENS. 



109 



Hemionitis citrifolia, Hook. Sp. Fil. — West Indies 

 and Tropical America. 



2. PolyhotrycB. Vernation generally uniserial, distant or 

 contiguous. Fronds pinnate or li-tripirmate, rarely flabellate, 

 segments adherent or articulate with the rachis. Veins free or 

 conibined at the margin, or anastomosing m various ways. 



* Veins free. 



t Segments adherent. 



33. RHIPIDOPTEKIS, SchoU. 



Vernation uniserial; sarmentnm slender, filiform. Fronds 

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



Geijus 33.— Fertile and barren IVonds. No. 1. 



lobed or dichotomously multifid. Veins flabellately forked, free. 

 FiitHe frond subrotund, entire' or bUobed, sporangiferous on the 

 under side. 



