class - (biology) a taxonomic group containing one or more orders

division Pteridophyta, Pteridophyta - containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta

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

family Schizaeaceae, Schizaeaceae - small family of mainly tropical ferns

family Marsileaceae, Marsileaceae - clover ferns

family Salviniaceae, Salviniaceae - water ferns

Ophioglossales, order Ophioglossales - coextensive with the family Ophioglossaceae

Filicales, order Filicales, order Polypodiales, Polypodiales - true (leptosporangiate) ferns

Adiantaceae, family Adiantaceae - used in some classification systems for some genera of the family Polypodiaceae (or Pteridaceae)

Cyatheaceae, family Cyatheaceae - tropical tree ferns

Davalliaceae, family Davalliaceae - one of a number of families into which Polypodiaceae has been subdivided in some classification systems

Dennstaedtiaceae, family Dennstaedtiaceae - one of a number of families into which Polypodiaceae has been subdivided in some classification systems

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

family Lomariopsidaceae, Lomariopsidaceae - small family of usually scandent ferns

family Lophosoriaceae, Lophosoriaceae - very small family of tree ferns

family Loxomataceae, Loxomataceae - very small family of New Zealand ferns

Marattiales, order Marattiales - lower ferns coextensive with the family Marattiaceae

Cryptogrammataceae, family Cryptogrammataceae - one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems

family Thelypteridaceae, Thelypteridaceae - genera Thelypteris; Phegopteris; others