II

THOSE WHICH HAVE THE FRUITING PORTION ON THE BACK OR MARGIN OF FRONDS


A. INDUSIUM WANTING

[Illustration]

1. Fruit-dots large, roundish; fronds evergreen. Rock species.

Polypody. _Polypodium_.

[Illustration]

2. Fruit-dots small, roundish; fronds triangular.

Beech Ferns. _Phegopteris_.

[Illustration]

3. Fruit in lines on the margin of the pinnules; under surface of the
fronds covered with whitish powder.

Cloak Ferns. _Notholæna_.


B. INDUSIUM PRESENT