CHARACTERS OF TRIBES AND GENERA. 301 



no less than ten genera, several of which I adopt as 

 sectional names only. 



The species are widely distributed within or near the 

 tropics of both hemispheres. 



* Apices of the venules free. 

 t Sort costal (Blechnum, Presl.). 



Sp. B. lanceola, Sw. (v v.) var. B. trifoliatum, Kaulf. 

 (v v.) ; B. asplenioides, Sw. (B. unilateral, Willd.) ; B. 

 glandulosum, Link, (v v.) ; B. cognatum, Presl (v v.) ; B. 

 polypodioides, Radd, Fit. Bras., t. 60, fig. 2 (v v.) ; B. trian- 

 gulare, Link, (v v.) ; B. occidentale, Linn, (v v.) ; B. cam- 

 pylotis, /. Sm. (v v.) (Lomaria, Kze. ; B. arcuatum? G. 

 Gay) ; B. australe, Linn, (v v.) ; B. gracile, Kaulf. (v v.) ; 

 B. longifolium, H. B. K. (v v.) ; B. intermedium, Link. 

 (v v.) ; B. fraxineum, Willd. (v v.) ; B. Fendleri, Hook. 

 (Sp. Fil., 3 t. 158). 



ft Sori medial or nearly so (JMesotliema, Pr.}. 



B. hastatum, Kaulf. (v v.). 



OBS. Presl refers ten species to this section, several of 

 which are not well identified species, and others more 

 properly belong to Lomaria. 



** Apices of the venules thickened, forming a cartilaginous 



margin (Blechnopsis, Presl). 

 f Pmnce adherent to the rachis. 



Sp. B. brasiliense, Desv. (v v.) ; B. cartilagineum, Sw. 

 (v v.) ; B. nitidum, Pr. ; B. laevigatum, Oav. (v v.) ; B. 

 orientale, Linn, (v v.) ; B. Finlaysonianum, Wall. 



ft Pinnce articulated with the rachis (Diafnia, Pr.). 

 B. striatum, JB. Br. (v v.) ; B. serrulatum, Rich, (v v.). 



