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 
tropies of both hemispheres. 
* Apices of the venules free. 
t Sori costal (Blechnum, Presl.). 
Sp. B.lanceola, Sw. (v v.) var. B. trifoliatum, Kaulf. 
(v v.); B. asplenioides, Sw. (B. unilaterale, Willd); B. 
glandulosum, Link. (v ei: B. cognatum, Presl (v v.) ; B. 
polypodioides, Radd, Fil. Bras., t. 60, fig. 2 (v v.) ; B. trian- 
gulare, Link. (v v.); B. occidentale, Linn. (v v.) ; B. cam- 
pylotis, J. Sm. (v v.) (Lomaria, Kze.; B. arcuatum? O. 
Gay); B. australe, Linn. (v v.); B. gracile, Kaulf. (v v.) ; m 
B. longifolium, H. B. K. (vv.); B. intermedium, Link. 
(v v.); B. fraxineum, Willd. (v ei: B. Fendleri, Hook. 
(Sp. Fil., 8 t. 158). ; 
tt Sori medial or nearly so (Mesothema, Pr.). 
B. hastatum, Kaulf. (v v.). 
Oss.—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). 
+ Pinne adherent to the rachis. 
Sp. B. brasiliense, Desv. (v v.); B. cartilagineum, Sw. 
(vv); B. nitidum, Pr.; B. levigatum, Cav. (v v.); B. 
. orientale, Linn. (v v.) ; B. Finlaysonianum, Wall. l 
eg artiodatel wiih dha roohia (Diafnin, Pròsa 
` B. striatum, R. Br. (v v.); B. serrulatum, Rich. (v v). ` 
