184 J. SMITH ON THE GENERA OF FERNS. 



80. Sagenta, PresL J. Sm, 

 (Aspidii sp. Authors.) 



Veins forked ; venules arcuately and angularly anastomos- 

 ing, forming unequal areoles; sporangia produced on the 

 angles or points of meeting of two or more venules, or on 

 the apex of a free veinlet, terminating in the areoles, consti- 

 tutins round sort,- indusium orbicular or reniform. 



Fronds pinnate, or bipinnate ; pinncB lobed or sinuously- 

 pinnatifid ; sori disposed in a row on each side of the idtimate 

 midrib or irregidar. 



Examp. 1. S. varia, {Sw.) 2. S. Hippocrepis, (Sw.) 3. 

 S. apiifolia, {Schk.) 4. S. coadunatum, ( Wall.) 5. S. pla- 

 typhylla, J. Sm. 6. S. intermedia, J. Sm. Illust. Hook. 

 et Grev. Ic. Fil. t. 202. Schk. crypt, t. 56. b. Hook. Gen. Fit. 

 t. 53. A. 



Obs. Sagenia differs but little in habit from Aspidium, and 

 is distinguished as a genus principally by the absence of the 

 irregular free veinlets which characterize the venation of 

 Aspidium. 



81. FhEOCi^EMiAj PresL J. Sm. 

 (Polypodii sp. Gaud.) 



Veins forked ; the lower venules arcuately and angularly 

 anastomosing, forming unequal areoles; the superior venules 

 free and fertile ; sporangia medial ; sori round ; indusium 

 reniform. 



« Rhizoma arboreus." Fronds \b to \1 feet high, bi-tri- 

 pinnate, ultimate segments pinnatifd ,- veins of the lacinia,forkedj 

 the superior venules soriferous, forming a row on each side of 

 the midrib of the lacinice. 



Species. V . Leuceana, Presl. (Polypodium, G««c?.) IH^^^- 

 Hook. Gen. Fil. t. 97. 



Obs. This genus is founded upon a solitary species, and 

 differs from the preceding genus principally by its more gi- 

 gantic habit, than in the character of the venation and son, 

 the sterile frond exhibiting venation similar to Sagenia, but 

 on account of the ultimate laciniae of the fertile frond being 



