[Illustration]

2. Fruiting portion at the apex of the frond. Sterile pinnæ palmate; rachis
twining.

Climbing Fern. _Lygodium_.

[Illustration]

Sterile pinnæ pinnate; fronds large, fertile portion green, turning brown,
forming a panicle at the top.

Royal Fern. _Osmunda regalis_.

[Illustration]

3. Fruiting portion seemingly on a separate stock a few inches above the
sterile.

Sterile part an entire, ovate, green leaf near the middle; fertile part a
spike.

Adder's Tongue. _Ophioglossum_.

[Illustration]

Sterile portion more or less divided; fruit in racemes or panicles, rarely
in spikes.

Grape Ferns. Moonwort. _Botrychium_.