| Noun | 1. | genus Oreopteris - 3 species of ferns formerly included in genus Dryopteris or Thelypterisfern genus - genera of ferns and fern allies family Thelypteridaceae, Thelypteridaceae - genera Thelypteris, Phegopteris, and others Dryopteris oreopteris, mountain fern, Oreopteris limbosperma - common European mountain fern having fragrant lemon or balsam scented fronds |