(Fertile and sterile fronds entirely unlike)
[Illustration]
1. Fruit in a one-sided spike in two ranks; plants very small; sterile
fronds thread-like and tortuous.
Curly Grass. _Schizæa_.
[Illustration]
2. Fruit in a club-shaped, brown or cinnamon-colored spike loaded with
sporangia; fruit in early spring.
Cinnamon Fern. _Osmunda cinnamomea_.
[Illustration]
3. Fruit in berry-like, greenish structures in a twice pinnate spike, which
comes up much later than the broad and coarse pinnátifid sterile fronds.
Wet ground. Sensitive Fern. _Onoclea_.
[Illustration]
4. Fruit in pod-like or necklace-like pinnæ; fertile frond pinnate; sterile
frond tall, pinnátifid; fruit late.
Ostrich Fern. _Onoclea struthiopteris_.