| genus osmunda | (n) type genus of the Osmundaceae |
| osmundaceae | (n) large family of ferns widely distributed in temperate and tropical areas, Syn. family Osmundaceae |
| cinnamon fern | (n) New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible, Syn. fiddlehead, Osmunda cinnamonea, fiddlehead fern |
| interrupted fern | (n) North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds, Syn. Osmunda clatonia |
| royal fern | (n) large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds, Syn. ditch fern, French bracken, king fern, royal osmund, Osmunda regalis |
