fern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

genus Osmunda - type genus of the Osmundaceae

ditch fern, French bracken, Osmunda regalis, royal fern, royal osmund, king fern - large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds

interrupted fern, Osmunda clatonia - North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds

cinnamon fern, fiddlehead fern, Osmunda cinnamonea, fiddlehead - New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible