172 J. SMITH ON THE GKNERA OF FERNS. 



there are a few species which have variously anastomosing 

 veins, which, taken in conjunction with the slight different 

 modifications of the sori, as above noticed, afford sufficient 

 character whereupon to constitute a few small natural genera. 



Sect. I. Orthophlebie^. 

 Venation free, none of the venules anastomosing. 



67. SCOLOPENDRIUM, Sm. 



Veins forked ; venules direct, free, parallel, the superior 

 and inferior branch of each fascicle approximating and spo- 

 ranguiferos on their proximate sides, constituting unilateral 

 linear sori, confluent in pairs. Indusia linear, the free mar- 

 gins of each pair conniving, forming as it were one sorus. 



Fronds linear-lanceolate^ plane or undulate, and divided at 

 the apex, usually cordate at the base, or pinnate. 



Species, 1. S. officinarum, Sm. 2. S. Hemionitis, Cav. 

 3. S, pinnatum, J. Sm. 



Illust. Schk. Crypt, t. 83. b. 84. Hook. gen. fil t. 57. B. 



Obs. This genus has been separated from Asplenium by the 

 sori being confluent in pairs, although they appear as but one 

 sorus with the indusium opening longitudinally in the middle; 

 but which consists of two separate indusia, attached on the 

 opposite sides of the two sporangiferous venules. 



68. DiPLAziuM, Sw. J. Sm. 



Veins forked or pinnate ; venules direct, free, all or the 

 lower ones only sporangiferous on both sides, constituting 

 binate, or simple, superior linear sori. Indusia generally 

 plain, linear. 



Fronds simple, pinnate, or bi-tripinnatiJid,from 1 to 6 or 8 

 feet high, usually smooth. Sori generally decussate. 



Examp. 1. D. plantagineum, Sw. 2. D. integrifolium, 

 Blume. 3. D. grandifolium, Siu. 4. D. porrectum, Wall 

 5. D, juglandifolium, Sw. 6. D. undulosum, Sw. T. D- 

 frondosum, Wall. 8. D. arborescens, Sw. 



Illust. Schk. Crypt, t. 15, 76, 85. Hook. gen.Jil. t. 55. B. 

 56, B. 



