J. SMITH ON THE GENERA OF FERNS. 51 



10. Gymnogramma. Desv. 



(Acrostichi sp, Linn. Grammitidis sp. Sw. and Authors.) 

 Veins forked, free. Sporangia medial. Sori linear, forked, 

 oblique, becoming confluent. — Rhizoma ccespitose. Fronds 

 simple, pinnate, hipinnate or decompound, smooth, villose, or 

 farinose, from a few inches to 2 or 3 feet in length. Sporan- 

 gia usually occupying nearly the ivhole length of the venules. 



* Fronds villose or glandidose. 



Examp. 1. G. vestita. Wall. Hook. 2. G. rufa. Desv. 

 3. G. tomentosa. Desv. 4. G. rutaefolia. Hook. 5. G. fili- 

 pendulsefolia. JJesv. 



** Fronds farinose or glabrous. 



6. G. falcata. J. Sm. (Hemionitis falcata. Harailt.) 7. G. 

 Javanica. Blume. 8. G. trifoliata. IJesv. 9. G. Peruviana. 

 Desv. 10. G. calomelanos. Kaulf. 11. G. chrysophylla. 



Kaulf. 12. G. chaerophylla. Desv lllust. Bauer s Gen. 



Fil. t. 37. Blume Fl. Jav. t. 41, 42. 



Obs. There can be no doubt but that there is great affinity 

 between some species of this genus and Hemionitis, which 

 genus is characterized with reticulated veins; but if Hemio- 

 nitis were to be placed here, then a train of other genera 

 would have to follow, which more naturally agree with suc- 

 ceeding genera, and which could not with propriety be placed 

 near Gymnogramma. 



11. Leptogramma. J. Sm. 



(Grammitidis sp. Presl. Gymnogrammatidis sp. ai Auth. 

 Poly podium § Pleurogramma. M. Br.) 



Veins costaeform, pinnate ; vemdes parallel, free. Spo- 

 rangia medial. Sori oblong-linear, simple, oblique. — Rhi- 

 zoma creeping or somewhat ccespitose. Fronds bipinnatifid, 

 1 to 2^ feet in length, smooth or villose. Veins usually ex- 

 ternal. Sori composed of few sporangia, ivhich are some- 

 times echinate. 



