CHARACTERS OF TRIBES AND GENERA. 223 



OBS. This genus is founded on a solitary species, which 

 in habit is so like some species of Ctenopteris, 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 glandtilosa, J. Sm. (Hook and Grev. loc. cite). 



Native of Jamaica and Cuba. 



Sect. 4. ARTHROPTERE^;. 



Fronds pinnate ; pinnse entire or subpinnatifid, articulate 

 with the rachis. 



OBS. This section consists of a few special genera, 

 which do not well associate with any of the genera in the 

 preceding sections ; but the pinnae 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, /. Sm. (1854). 

 Polypodiwn, 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 ; pinnaa oblong lan- 

 ceolate, J an inch to 2 or 3 inches long, entire or pinna- 

 tifid, articulated with the rachis. Veins simple, or forked, 



