lllT. GBNEEA OP I'EBNS: 



receptacles simple elongated and medial. Veins simple from a 

 central costa ; the lower or more opposite pairs angularly eon- 

 niTent-anastomosing. 



Fronds herbaceous, pinnate or pinnato-pinnatifld. Ehizome 

 thictish decumbent, or erect and sub-arborescent. — This is 

 among the GymnogrammecB what Nephrodium is among the 



Ex.: S. aspidioides, Blume. \ S. sandwicensis, Srackenridge. 



89. AMPELOPTERIS, Kunse, Sot. Zeit. vi. 114; Id., 



Lin. XX., 251. 



Sori non-indusiate, " roundish-oblong, oligooarpous, the spore- 

 cases mixed with copious large capitate glands," at length diffuse. 

 Veins simple from a central costa, " similar to Stegnogramma," 

 i.e., connivently anastomosing in opposite pairs. 



Fronds pinnate, coriaceous, the fertile contracted j the rachis 

 sometimes proliferous. — We are unacquainted with the ferns re- 

 ferred to this genus, except by the brief account given of them 

 by Kunze, from which it would appear that they come Tery near 

 to Stegnogramma, differing chiefly in the contracted fertile 

 fronds ; as, however, they seem to have been considered distinct 

 by that author, who was not addicted to the multiplication of 

 genera, we retain the genus on his authority, Kunze alludes 

 to the sori being "transverse," but it is not clear in what 

 sense this is intended, whether transverse in respect to the veins 

 or costa. Can he possibly refer to some meniseioid plant, in 

 which the sori would be transverse between the veins ? 



Ex. : A. elegaus, Zze. | A. flrma, Kze. 



(c) Veins arfcuate, forming costal a/reoles, the marginal venules 

 free. 



90. DIGRAMMARIA, Fresl, Tent. Pterid. 116, t. 4, fig. 



12, 17, (exol. syn.) 



HETETtOGOsiuM, PresZ; Stbwosemia, J". fi'miiA in part : Soolc&r et Bauer 

 in part, non Fresl, 



Sori non-iudusiate, linear-oblong j the receptacles linear medial. 

 Veins (sterile) from a central (secondary) costa ; the lower ones 



