a large, New World fern (Osmunda cinnamomea, family Osmundaceae) having sterile green fronds and other fronds that bear spores and turn a cinnamon color as the spores mature
A fern (Osmundastrum cinnamomeum syn. Osmunda cinnamomea) found throughout the Americas and in East Asia having narrow, spore-bearing, cinnamon-colored fronds in early spring, which are later encircled by long, pinnately compound, sterile fronds.
(plural cinnamon ferns)
- A coarse fern, Osmundastrum cinnamomeum, found primarily in wet areas.