CHARACTERS OF TRIBES AND GENERA. 231 



orientalis. With regard to the two first, herbarium speci- 

 mens lead to the inference that they only represent one 

 species, nevertheless, cultivated plants are readily recog- 

 nised as being distinct. The Indian species differs in the 

 fertile pinnes being less involute and more flat than in the 

 preceding. 



Although the species of Struthiopteris are perfectly dis 

 tinct in mode of growth and venation from Onoclea sensibilis, 

 nevertheless they are in "Species Filicum" placed under 

 the latter genus, and S. pennsylvanica is described as 

 having a special indusium to each sorus, but which I have 

 failed to discover. 



Sp. S. germanica, Willd. (v v.) ; S. pennsylvanica, Willd. 

 (v v.) ; S. orientalis (Hook. 2nd. Cent. Ferns, t. 4). 



Sect. 7. PHEGOPTERE.E. 



Fertile pinnce plane. Sori punctiform, rarely oblong 

 linear. 



122. LEPTOGRAMMA, /. Sni. (1841). 

 Gymnogramma, sp. Sw. Hook. Sp. Fil. 



Vernation fasciculate, erect, acaulose, or decumbent. 

 Fronds bipinnatifid, 1 to 3 feet high. Veins of lacinae 

 costaeform, pinnate ; venules free, a portion of their length 

 sporangiferous, forming oblong or linear sori. 



Type. Polypodium lottum, Willd. 



Illust. Hook, and Bauer, Gen. Fil., t. 72; Moore Ind, 

 Fil., p. 49 A, fig. 5 ; J. Sm. Ferns, Brit, and For., 

 fig. 49. 



OBS. This genus agrees in habit and venation with the 

 bipinnatifid species of Phegopteris, differing only in the 

 receptacles being elongated on the venules, thus con- 



