fern genus - genera of ferns and fern allies

Athyriaceae, Dryopteridaceae, family Athyriaceae, family Dryopteridaceae - alternative names for one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems

bladder fern - any fern of the genus Cystopteris characterized by a hooded indusium or bladderlike membrane covering the sori