Table of the Genera of Ferns. 
XI 
tribe IX.— aspidie^e. 
Indusium superior, elliptical, subglobose or reni- 
form fixed either by the centre or a sinus. 
Indusium elliptical, emarginate at the base, attached 
longitudinally to the linear receptacle, veins free . 
Indusium of Didymochlsena habit, and venation of 
Nephrodium ....... 
Indusium orbicular, veins free 
Indusium orbicular, veins generally anastomosing 
acutely with free veinlets from their junction . 
Indusium peltate orbicular, or reniform, veins co- 
piously anastomosing with free included veinlets . 
Indusium reniform, veins only slightly anastomosing . 
Indusium reniform, veins free 
Indusium reniform, one or more of the lower veinlets 
anastomosing with the corresponding one of the 
next group . 
As in Lastrea, but always simply pinnate, the pinna; 
articulated and furnished with white dots above 
As in Lastrea, but wide creeping and scandent with 
jointed stems and entire fronds .... 
B. Exinvolucrat^. — Sort without an indusium. 
TRIBE X.— POLYPODIEyE. 
Sori on the back of the lobes, round or rarely 
somewhat oblong. 
Stipes continuous with the caudex, habit of Lastrea, 
veins free 
Stipes continuous with caudex, venation and habit of 
Nephrodium ....... 
Stipes continuous with caudex, venation and habit of 
Aspidium 
Stipes articulated with caudex, veins fiee . 
Veins forming regular areoles, the lower one or more 
with a free included soriferous veinlet . 
Genus. 
Page. 
47 DlDYMOCHL^NA I99 
48 Mesochl/Ena . 199 
49 polysticiium . 201 
50 CyRTOMIUM . 211 
51 Aspidium . .212 
52 Pleocnemia . 223 
53 Lastrea . . 228 
54 Nephrodium . 267 
55 Nephrolepis . 282 
56 Oleandra . 285 
57 Phegopteris . 288 
58 Goniopteris . 296 
59 Dictyopteris . 298 
60 Polypodium . 302 
6[ Goniophlebium 316 
