1256 ' BENGAL PLANTS. [ Polypodium. 
Areole uniform, bounded by parallel, reba or curved, transverse 
veinlets aia the primary veins, which run distinctly from mid- 
rib to edge; areole containing 2 er more sori, the contained free vein- 
lets all aa wean rds the edge; fronds simple, their under surface 
matted with thin, adpressed, woolly or cottony tomentum :— 
Stipes distant; fronds dimorphic; sori in 5-6 series ...... adnascens. 
Stipes aggregated ; fronds uniform; sori in 8-10 series ...stigmosum. 
Areolse penta fine and copious; the free veinlets spreading in 
various directions; sori generally on the back of united veinlets; 
fronds n t felted or cottony beneath :— 
Main-veins hades in the aie substance of the frond, not dis- 
imp 
tinct to the edge of the fro lex. 
Main-veins distinet hen or eae to the edge of the fron epi 
Texture thin, membranous; main-nerves distinet; sori large, 
mostly in 2 rather eee rows near the main-vein 
pei 
Texture firm, thickly aro or subcoriaceous :— 
veins distinct; sori large :— 
tase Veina passing ‘ike to the edge ; sori rene 
BOW ce ee at ec Acs ides varcscoddaeabeneoucess 
Main-veins branching and becoming lost before shy ‘quite 
reach the edge ; sori in one irregular row, often conflu ent 
hemionitideum. 
, y tak: © 
atum. 
Main-veins very fine; sori small, very copious and 8 arly 
scattered, often only pra apex of frond .....++++++ oides. 
sie more or less lobed or divided :— 
Fronds uniform, all LL. or ae some ag or partly sterile, the 
sterile portion in ee like the fer 
Fronds with distinct midrib or sche ‘ao divided into two 
halves ; Sushhe winged :-— 
Fronds 3-fid or pinnatifid, with 2 lobes on each sides, fae 
some fronds subentire ; the end lobe always larger than : 
ateral pteropus. 
Fronds aetoly pinnatifid, with 2-6 lobes on each ore rarely 
only 
obe similar to the lateral td 
Fronds fubellately divided into two halves, each ‘ea lo! 
ooceveeee® 
_.Wallicht 
or with 
d 
a separate frond ee tod erm brownish in colour an 
rigid in texture like e oak-leaf :-— 
Sterile frond the Sided portion of the fertile 
Sterile frond distinct from the fertile ........--..6++++ q' 
