| oreopteris | (n) 3 species of ferns formerly included in genus Dryopteris or Thelypteris, Syn. genus Oreopteris |
| mountain fern | (n) common European mountain fern having fragrant lemon or balsam scented fronds, Syn. Dryopteris oreopteris, Oreopteris limbosperma |
| Oreopteris | prop. n. A genus of ferns having species, formerly included in genus |