WordNet sense 1 (tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes):

ostrich fern, Matteuccia struthiopteris, Onoclea struthiopteris, Pteretis struthiopteris, shuttlecock fern

WordNet sense 2 (New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible):

cinnamon fern, fiddlehead fern, Osmunda cinnamonea