Cinnamon fern (Osmunda cinnamomea)
Common fern of river bottoms, swamps, streambanks, wet depressions, and wet woods. Large fronds (up to 5 feet tall) with rusty tufts on the pinnae. Fertile fronds turn cinnamon/brown in late May. Robust creeping rhizome, very stubbly. Large fiddleheads are covered by silvery, white hairs. Fiddleheads are mildly toxic and may cause nausea, dizziness, and headache if eaten. Easily distinguished from the prized Ostrich fern fiddlehead by the lack of brown, paper-like scales covering the emergent fiddleheads.