CHARACTERS OF TRIBES AND GENERA, 223 
... OBs.—This genus is founded on a solitary species, which 
in habit is so like some species of Cienopteris, that it might 
be referred to that genus, but the presence of indusia shows 
it to belong to Aspidece. Its free veins, and generally orbi- 
cular peltate indusium, led me to originally refer it to 
Polystichum. In habit, however, it is totally at variance 
with any species of that genus, as also with Lastrea ; I 
therefore deem it best to characterise it as a distinct genus, 
and view it with Camptodium as an aberrant species between ` 
these two genera. 
Sp. A glandulosa, J. Sm. (Hook and Grev. loc, cite). 
Native of Jamaica and Cuba. 
Sect. 4. —ARTHROPTERE. 
Fronds pinnate ; pinne entire or subpinnatifid, articulate | 
with the rachis. 
Oss.—This section consists of a few special genera, 
which do not well associate with any of the genera in the 
preceding sections; but the pinnæ being articulate with 
the rachis, and the presence of white chalky dots on the 
upper surface, opposite the apex of each vein, seems to indi- 
cate their relationship to one another, which will be 
specially noticed under each genus. 
116.—ARTHROPTERIS, J. Sm. (1854). 
Polypodium, Nephrodium, and Nephrolepis, Hook., Sp. Fil. 
= Vernation uniserial ; sarmentum slender, stipes pseudo- 
. articulate; the node of articulation basal or more or less 
elevated. Fronds pinnate, 1 to 2 feet or more long, simple 
or repeatedly dichotomously branched ; pinnw oblong lan- 
` ceolate, 4 an inch to 2 or 3 inches long, entire or pinna- - de 
 tifid, articulated with the rachis. Veins simple, or forked, - ie 
