AN ENJAIERATION OF CULTIVATED FERNS. 200 



flexuos* 1 , climbing to an indefinite height ; pinnaa 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, 

 Bporangiferous along its base. 



1. S. volubile, J. Sm. m Hook. Gen. Fil. t. 93. Blechnum 

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

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

 t. 36. — Tropical America. 



Tribe IX.-ASPLENXE.2E. 



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

 tion. Furnished with a plane or vaulted lateral indusium. 



110. ASPLENITJM, Linn. 



Vernation fasciculate, erect or decumbent, rarely uniserial 

 sarmentose. Fronds varying from simple-entire to decompound 

 and from a few inches to 2-6 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 vektjm. — Indusium plane. 



1. Lanceum group. 



Vernation uniserial, sarmentum slender. Fronds distant, 

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

 hhiate. (Triblemma.) 



1. A. lanceum, Thunb. Ie. Plant. Jap. Dec. 11, 1. 18. A. subsi- 

 nuatum, Hook, et Grev. la. Fil. t. 27. Diplazium lan- 

 ceum, Presl. Scolopendrium dubium, Don. — India, 

 China, Japan. 



2. Serratum group. 



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

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



i. A. serratum, Linn. (Plum. Fil. t. 124); Sclik. Fil. t. (A; 

 ' Hook. Fil. Exot. t. 70. — Tropical America. 

 P 



