or of the whole pinnules; often inconspicuous, fronds usually hairy. Lip
Ferns. _Cheilanthes_.

[Illustration]

Indusium of the reflexed edges, at first reaching to the midrib, or nearly
so; later opening out nearly flat; fruiting pinnules pod-like; sterile
fronds broad. Rock brakes. _Cryptogramma_.

[Illustration]

3. Indusium never formed of the margin of the frond. Sori various.

(1) Fruit-dots oblong, parallel with the midrib, somewhat sunken in the
tissues of the frond. Water-loving species. Chain Ferns. _Woodwardia_.

[Illustration]

(2) Fruit-dots and indusium roundish.

Indusium shield-shaped, fixed by the center. Evergreen glossy ferns in
rocky woods. Shield Ferns. _Polystichum_.

[Illustration]

Indusium cordate, fixed by the sinus. Wood Ferns. _Aspidium_.

[Illustration]

Indusium hood-shaped, fixed centrally behind the sorus and arching over it,