#fern_family  families of ferns and fern allies
  supertype:  #family  (biology) a taxonomic group containing one or more genera; "sharks belong to the fish family"
  member of:  #division_Pteridophyta
  subtype:  #family_Hymenophyllaceae__Hymenophyllaceae  terrestrial (hygrophytic) or epiphytic ferns: filmy ferns
  subtype:  #family_Osmundaceae__Osmundaceae  large family of ferns widely distributed in temperate and tropical areas
  subtype:  #family_Schizaeaceae__Schizaeaceae  small family of mainly tropical ferns
  subtype:  #family_Marsileaceae__Marsileaceae  clover ferns
  subtype:  #family_Salviniaceae__Salviniaceae  water ferns
  subtype:  #family_Azollaceae__Azollaceae  used in some classifications for the genus Azolla
  subtype:  #family_Ophioglossaceae__Ophioglossaceae  a family of succulent ferns of order Ophioglossales; cosmopolitan in distribution
  subtype:  #family_Gleicheniaceae__Gleicheniaceae  a family of ferns belonging to order Filicales
  subtype:  #family_Parkeriaceae__Parkeriaceae  coextensive with the genus Ceratopteris; sometimes included in family Polypodiaceae
  subtype:  #family_Polypodiaceae__Polypodiaceae  ferns: a large family that in some classification systems has been subdivided into several families (including Aspleniaceae and Blechnaceae and Davalliaceae and Dennstaedtiaceae and Dryopteridaceae and Oleandraceae and Pteridaceae)
  subtype:  #family_Adiantaceae__Adiantaceae  used in some classification systems for some genera of the family Polypodiaceae (or Pteridaceae)
  subtype:  #family_Vittariaceae__Vittariaceae  one of a number of families into which Polypodiaceae has been subdivided in some classification systems: genus Vittaria
  subtype:  #family_Aspleniaceae__Aspleniaceae  one of a number of families into which Polypodiaceae has been subdivided in some classification systems; includes genera Asplenium; Pleurosorus; Schaffneria
  subtype:  #family_Blechnaceae__Blechnaceae  one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; includes genera Blechnum; Doodia; Sadleria; Stenochlaena; Woodwardia
  subtype:  #family_Cyatheaceae__Cyatheaceae  tropical tree ferns
  subtype:  #family_Davalliaceae__Davalliaceae  one of a number of families into which Polypodiaceae has been subdivided in some classification systems
  subtype:  #family_Dennstaedtiaceae__Dennstaedtiaceae  one of a number of families into which Polypodiaceae has been subdivided in some classification systems
  subtype:  #family_Dicksoniaceae__Dicksoniaceae  tree ferns: genera Dicksonia; Cibotium; Culcita; Thyrsopteris
  subtype:  #family_Dryopteridaceae__Dryopteridaceae__Athyriaceae__family_Athyriaceae  alternative names for one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems
  subtype:  #family_Lomariopsidaceae__Lomariopsidaceae  small family of usually scandent ferns
  subtype:  #family_Lophosoriaceae__Lophosoriaceae  very small family of tree ferns
  subtype:  #family_Loxomataceae__Loxomataceae  very small family of New Zealand ferns
  subtype:  #family_Oleandraceae__Oleandraceae  one of a number of families into which Polypodiaceae has been subdivided in some classification systems
  subtype:  #family_Pteridaceae__Pteridaceae  one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; Pteridaceae is itself in turn sometimes further subdivided
  subtype:  #family_Marattiaceae__Marattiaceae  constituting the order Marattiales: chiefly tropical eusporangiate ferns with gigantic fronds
  subtype:  #family_Psilotaceae__Psilotaceae  small family of lower ferns having nearly naked stems and minute scalelike leaves
  subtype:  #family_Psilophytaceae__Psilophytaceae  Paleozoic plants
  subtype:  #family_Rhyniaceae__Rhyniaceae  primitive plants of the Paleozoic
  subtype:  #family_Equisetaceae__Equisetaceae__horsetail_family__horsetailfamily  sole surviving family of the Equisetales: fern allies
  subtype:  #family_Lepidodendraceae__Lepidodendraceae  fossil plants characterized by conspicuous spirally arranged leaf scars on the trunk
  subtype:  #family_Lycopodiaceae__Lycopodiaceae__clubmoss_family  a family of ferns belonging to the order Lycopodiales
  subtype:  #family_Selaginellaceae__Selaginellaceae  lesser clubmosses: terrestrial chiefly tropical plants resembling mosses
  subtype:  #family_Isoetaceae__Isoetaceae__quillwort_family__quillwortfamily  quillworts; coextensive with the genus Isoetes
  subtype:  #family_Cryptogrammataceae__Cryptogrammataceae  one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems
  subtype:  #family_Thelypteridaceae__Thelypteridaceae  genera Thelypteris; Phegopteris; others

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