J. SMITH ON THE G"ENERA OF FERNS. 61 



points of meeting of generally numerous venules ; and al- 

 though the species agree tolerably well, as regards that char- 

 acter, yet there are some striking peculiarities in habit and 

 disposition of the sori, which have induced me to arrange them 

 under the following sections, that may be considered as nearly 

 equivalent to genera. 



* Phymatodfs. J. Sm. 



Fronds simple, pinnatifid or pinnate. Sori round, rarely 

 oblong, or by confluence, linear, often immersed, transversely 

 uni- or rarely biserial. 



Examp. 1. D. loriforme ; {Wall.) 2. D. normale; (Don.) 

 3. D. stenophylla ; (Blume.) 4. D. pustulata ; (Z^ors^.) 5. 

 D. vulgare; {J. Sin.) (Poly, phymatodes, Linn.) 6. D. 

 leiorhiza; {Wall.) — Illust. Schk. Crypt, t. 10. Hook, et Grev. 



Ic. Fil. t. 209. 



** DiPTERis. (Jieimu.) 



Fronds simple, entire, linear lanceolate, or bipartite and 

 digitate, rarely cordate. Sori round or rarely oval, superfi- 

 cial, in one or two rows between the primary veins, or irreg- 

 ular and numerous. 



Examp. 7. D. Horsfieldii ; {R. Br.) 8. D. Wallichii; 

 {R. Br.) 9. D. spectrum ; {Kaulf.) 10. D. plantaginea; 

 {Willd.) U. D. crassifolia; {Linn.) 12. D. hemionitidea ; 

 ( Wall.)— Illust. Hook, et Grev. Ic. Fil. t. 125. Hon^feld's Fi. 

 Jav. t. 1. Bauer's gen. fil. t. 29. Schott. gen. fil. t. 1. 



*** Drynaria vera. Bory. 



Fronds rigid, of two forms, the sterile sessile oblong-cor- 

 date, sinuose or laciniated, the vascular structure rigid and 

 permanent, fertile fronds two to three feet long, pinnatifid 

 or pinnate. The pinnse articulated with the racliis. Sori 

 round, in one or two rows between, and parallel with the 

 primary veins or transversely uniserial. 



Examp. 13. D. quercifolia; {Bory. Linn.) 14. D. coro- 

 nans; {Wall.) 15. D. propinqua; {Wall.) 16. D. diversi- 

 folia; {R. Br.) 



