38 
CATALOGUE OE PERNS. 
or vaulted, rarely obsolete. Fronds uniform, or the fertile con- 
tracted and spiciform. 
57. ELECHNUM, Linn. ; Presl. 
(Mesothema, Presl. Blechnopsis, Presl.) 
Vernation fasciculate, erect; corm caudiciform or csespitose. 
Fronds simple, pinnatifid, or pinnate, from a few inches to 4-6 
feet high ; pinnae adherent or articulated with the rachis. Veins 
forked ; the sterile free, or their apices thickened and forming a j 
cartilaginous margin ; the fertile combined near their base by a 
transverse, continuous, sporangiferous receptacle, constituting a 
linear, costal or sub-medial sorus. Indusium linear, plane. 
* Apices of the venules free. 
f Sori costal . (Bleehnum, Presl.) 
1. B. I*anceola, Sw. ; Lodd. Cab. 1592; HooJc. Pot. Mag. t. 
3240 ; Kunze , Fil. t. 57./. 1. B. lanceolatum, Radd. Fit. 
Bras. t. 60./. 3. — Brazil. 
2. B. polypodioides, Radd. Fil. Bras. t. 60. /. 2; Kunze , 
Fil. t. 58. /. 1. — Brazil. 
3. B. glandulosum, Link ; Kaulf. ( non Kunze). — Brazil. 
4. B. cogmatum, Presl. B. glandulosum, Kunze , Fil. t. 58./. 
2.— Tropical America. > 
5. B. triangulatum, Link. — Tropical America. 
6. B. occidentale, Linn. ; Plum. Fil. t. 62 ; Jacq. Lc. Bar. t. 
644 ; Kook. Gen. Fil. t. 54. — Tropical America. 
7. B. gracile, Kaulf. ; Lodd. Cab. t. 1905. — Tropical America. 
8. B. longifolium, H. B. K. ; Hook. Bot. Mag. 2818. — Tro- 
pical America. 
ft Sori medial. (Mesothema, Presl.) 
9. B. hastatum, Kaulf. Lomaria hastata, Kunze , Fil. t. 95. 
/. 1.— Chili. 
** Apices of the venules thickened , forming a cartilaginous 
margin. (Blechnopsis, Presl.) 
f Pinnae adherent. 
10. B. Brasiliense, Lesv. B. Corcovadense, Radd. Fil. Bras . 
t. 61. — Brazil. 
