CHARACTERS OF TRIBES AND GENERA, 297 
‘into a few species. In the “Species Filicum” six 
species only are enumerated ; but having had the oppor- 
tunity of examining not less than eight species in a living 
state, has led me to increase the number to about a dozen. 
Sp. N. undulata (Sw.) (v v.). 
Oss.—Sir Wm. Hooker unites this with N. tuberosa, but 
viewing living plants proves them to be very distinct. The 
fronds of the present species dying down annually, — 
in N. tuberosa they are permanent. 
N. pectinata (Willd.) (v v.); N. pendula (Radd.); N. 
. exaltata (Sw.) (v v.) ; N. cordifolia (Linn.) ; N. tuberosa 
(Bory.) (v v.); N. volubilis (J. Sm.) ; N.ensifolia (Sw.) (vv.); 
N. hirsutula (Sw.) (v ei: N. biserrata (Sw.) (v v.); N 
splendens (Willd.); N.davallioides (Sw.) (v v.) ; N. abrupta 
(J. Sm.) (Leptopleura abrupta, Presl.). 
Oss.— This species is a native of Bourbon and is probably 
not distinct from the preceding one which is a very elegant 
species, a native of India and Java; it differs from other 
species of the genus in the upper pinne being contracted, 
which are sinuously lobed, each lacinæ and lobe bearing a 
sorus, furnished with a nearly orbicular indusium, the free 
exterior margin of which connives with the margin of the 
lobe, which becomes partially reflexed, and thus forming as 
it were a bilabiate cyst, analogous to the tribe Dicksonia, 
which circumstance led Presl to characterise it as a distinct 
genus under the name of Leptopleura. 
119.—IsorowA, J. Sm. (1841). 
Lindsea, Hook. Sp. Fil. 
Vernation fasciculate, erect, stoloniferous. Fronds linear, 
1 to 2 feet long, pinnate ; pinne oblong, elliptical or lan- 
culate; petiole short, articulate with the rachis. Veins - i 
ceolate, faleate, coriaceous, the base truncate and sub-auri- 
