II — Those Which Have the Fruiting Portion on the Back or Margin of Fronds
A. Indusium Wanting
1. Fruit-dots large, roundish; fronds evergreen. Rock species.
Polypody. Polypodium.
2. Fruit-dots small, roundish; fronds triangular.
Beech Ferns. Phegopteris.
3. Fruit in lines on the margin of the pinnules; under surface of the fronds covered with whitish powder.
Cloak Ferns. Notholæna.