AN ENUMEEATION OP CULTIVATED FERNS. 209 



flexuose, climbing to an indefinite height ; pinnj-e 1-2 feet long, 

 adherent. Veins forked; venules combined by a transverse 

 marginal vein, and in the fertile also near their base by a 

 transverse, continuous, sporangiferous receptacle, forming a 

 linear costal sorus. Indusium revolute, vaulted, cylindrical, 

 sporangiferous along its base. 



1. S. volubile, /. 8m. in Hook. Gen. Fil. t. 93. Bleclmnm 

 volubile, Kaulf. ; Kunze, Anal. t. 13 ; Hook. Gard. 

 Ferns, 1. 15. Blechnum scandens, Bory, in Dup. Voy. 

 t. 36. Tropical America. 



TKIBE IX.-ASPLENIE^E. 



Sori oblong or linear, oblique to the midrib or axis of vena- 

 tion. Furnished with a plane or vaulted lateral indusium. 



110. ASPLENIUM, Linn. 



Vernation fasciculate, erect or decumbent, rarely uniserial 

 sarmentose. Fronds varying from simple-entire to decompound 

 and from a few inches to 26 feet high, generally smooth 

 Veins rayed, forked, or pinnate ; venules free, sporangiferous on 

 the superior side. Sori simple, oblong, or linear. Indusium 

 plane or vaulted. 



1. ASPLENIUM VERTJM. Indusium plane. 



1. Lanceum group. 



Vernation uniserial, sarmentum slender. Fronds distant, 

 linear-lanceolate, 1-1 i foot long. Sori simple, anti or opposite 

 linate. (Triblemma.) 



1. A. lanceuin, Thunb. Ic. Plant. Jap. Dec. 11, 1. 18. A. subsi- 



nuatum, Hook, et Grev. Ic. Fil. t. 27. Diplazium Ian- 

 ceum, Presl. Scolopendrium dubium, I)on. India, 

 China, Japan. 



2. Serratum group. 



Vernation fasciculate, erect. Fronds simple, broad, elliptical, 

 or lanceolate, 1-2 feet long. (Phyllitis.) 



2. A. serratum, Linn. (Plum. Fil t. 124); Schk. Fil. t. 64; 



Hook. Fil. Exot. t. 70. Tropical America. 

 P 



