17218 Osmunda ferns form spores on a modified frond. For this species, a spore-bearing frond grows from the rhizome separate from sterile fronds. Distinguished from all other native ferns by its large sized and decidedly unfern-like sterile fronds. A large fern of lakeshores and wet places. Grows from crown rather than runners, so the plant spreads slowly.
Leaflets turn golden brown in autumn.
Northern North America, south in mountains. Tolerates some sun if given adequate moisture, but does better in light shade.