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

Adiantum, genus Adiantum - cosmopolitan genus of ferns: maidenhair ferns; in some classification systems placed in family Polypodiaceae or Adiantaceae

Adiantum capillus-veneris, common maidenhair, southern maidenhair, Venus maidenhair, Venus'-hair fern, Venushair - delicate maidenhair fern with slender shining black leaf stalks; cosmopolitan

Adiantum pedatum, American maidenhair fern, five-fingered maidenhair fern - hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes

Adiantum bellum, Bermuda maidenhair, Bermuda maidenhair fern - delicate endemic Bermudian fern with creeping rootstock

Adiantum tenerum, brittle maidenhair, brittle maidenhair fern - tropical American fern with broad pinnae; widely cultivated