KEY TO THE GENERA. 
SECTION Il. 
(Sporangia on the under side of the fronds.) 
** INDUSIUM WANTING, 
Fruit-dot roundish, /arge,; evergreen, 
rock species. Polypody. ; 
POLYPODIUM, 
3. Fruit-dots roundish, swa//,; fronds 
triangilar.. _Peech ferns. 
: PHEGOPTERIS. 
3. Fruit 2 lines on the margins of the 
pinnules; under surface of the 
fronds covered with whzt7sh pow- 
der. . : NOTHOLANA. 
** INDUSIUM PRESENT. 
4. Sori on the edge of the pinnule ; spor- 
angia sessile at the base of a long 
bristle-like receptacle and sur- 
rounded by a funnel form, slightly 
two-lipped zzvolucre. Filmy fern. 
iiiuiemucaee TRICHOMANES, 
307 
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196 
200 
288 
289 
