S52 CRYPTOGAMIA. FILICES. 



A genus of near 120 species widely dispersed througii 

 both hemisplieres, from Siberia to New Holland. 



825. VITTARIA. Smith. 



Sori linear, continued ]on.2:itudinally along 

 the (iisk or towards the margin of thp frond. 

 Indnsium double, uninterriijited, the one open- 

 ing outwards, tl^e other inwards. 



Fronds narrow, very long- and linear, pendulous. 

 SyEciEs. 1. V. lineata. A fern indigenous to Florida 

 and the West Indies. 



S26. BLECHNUM. L. 



Sori linear, longitudinal, continued, parallel 

 with the ribs of the frond on eitlier side. IndU" 

 siiun superficial, uninterrupted, opening in- 

 wards. 



Species. 1. B. boreale. Also indigenous to Europe. % 

 serrulatum. 



827. WOODWARDIA. Smith. 



Sori oblong, distinct, straight, parallel with 

 the ribs of t!ie frond on either side. Indnsia su- 

 perficial, arched, opening inwards. 



Species. 1. W. Onocleoide.t. In Xevv Jersey, near Phi- 

 ladv iphla, nol uncommon in bushy sphagnose morasses, 

 with tlie follow ing-. Scarcely a congener with IV. vir^ii- 

 nicu. 2. virginica. 3. thelyptev aides. Ph. 



828. ADIANTUM. L, 



Son oblong or roundish. Iiidusia memhrana- 

 ceo»!s, arising ftom the margin of the frond and 

 opening inwards. 



Species. 1. A. pedntnm. Every where throughout the 

 Atlantic and western states. 



829. CHEILANTRKS. Swart%, 



iS^on punrtiforni, distinct, and marginal, each 

 covered with a squamiform and marginal Indu- 

 sium opening inwards. 



