Table of the Genera of Ferns. 



XI 



TRIBE IX.— ASPIDIE/E. 

 Inclusium 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 DidymochL~ena 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 pinnse 

 articulated and furnished with white dots above 



As in Lastrea, but wide creeping and scandent with 

 jointed stems and entire fronds .... 



B. Exinvolucratve. — Sori without an indusium. 



TRIBE X.— POLYPODIES. 



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 free . 



Veins forming regular areoles, the lower one or more 

 with a free included soriferous veinlet 



Genus. 



Page. 



47 DlDYMOCHL/ENA I99 



48 MESOCHLiENA . I99 



49 POLYSTICHUM . 201 



50 CYRTOMIUM . 211 



51 Aspidium . 



52 Pleocnemia 



53 Lastrea . 



. 212 

 . 223 

 . 228 



54 Nephrodium . 267 



55 Nephrolepis . 282 



56 Oleandra . 2S5 



57 Phegopteris . 288 



58 goniopteris . 296 



59 DlCTYOPTERIS . 298 



60 POLYPODIUM . 302 



61 GONIOPHLEBIUM 316 



