In the midst of the marsh were rows of the fruit-stems of the sensitive fern, which is the first to blacken before the frost.
As Waters remarks, "Most ferns hold the sori in the open hand, but the sensitive fern grasps them tightly in the clenched fist."
Onoclea sensibilis (sensitive fern), very common along the riversides; some on the gravelly shore of Heron Lake Island.
The sensitive fern is so called from its being very sensitive to frost.
An intermediate form between the fertile and sterile fronds is sometimes found, as in the sensitive fern.
As in the sensitive fern there are many curious gradations between the fertile and sterile fronds, both in shape and fruitfulness.
Not to mention, among inferior orders, wool-grass and the sensitive fern.