Leaves ample. 
Leaves ternate, branches 2-pinnate. 
&. Pteridium. 
Leaves pinnate, 2-pinnate below. 
g. Pellaea. 
Leaves 2-pinnate, pinnules pinnatifid. 
10. Chetlanthes. 
Leaves decompound, pinnules triangular- 
oblong. iI. Adiantum. 
Sori forming chainlike rows parallel to the 
midrib or central vein of the pinnules. 
Leaves uniform, pinnate-pinnatifid. 
12. Anchistea. 
Leaves of two kinds, fertile leaves pinnate, 
pinnae linear; sterile leaves deeply pinna- 
tifid. 13. Lorinseria. 
Sori linear or oblong, along the veins or scat- 
tered, 
Leaves various, veins free. 
Sori straight. I4. Asplenium. 
Sori sometimes curved; leaves pinnate to 
2-pinnate. 15. Athyrium. 
Leaves simple, veins united; sori scattered. 
16. Camptosorus. 
Sori orbicular. 
Indusium superior; plants robust. 
Indusium peltate; leaves pinnate. 
17. Polystichum. 
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