#fern_family  families of ferns and fern allies
  subtype:  family_Hymenophyllaceae  family_Osmundaceae  family_Schizaeaceae  family_Marsileaceae  family_Salviniaceae  family_Azollaceae  family_Ophioglossaceae  family_Gleicheniaceae  family_Parkeriaceae  family_Polypodiaceae  family_Adiantaceae  family_Vittariaceae  family_Aspleniaceae  family_Blechnaceae  family_Cyatheaceae  family_Davalliaceae  family_Dennstaedtiaceae  family_Dicksoniaceae  family_Dryopteridaceae  family_Lomariopsidaceae  family_Lophosoriaceae  family_Loxomataceae  family_Oleandraceae  family_Pteridaceae  family_Marattiaceae  family_Psilotaceae  family_Psilophytaceae  family_Rhyniaceae  family_Equisetaceae  family_Lepidodendraceae  family_Lycopodiaceae  family_Selaginellaceae  family_Isoetaceae  family_Cryptogrammataceae  family_Thelypteridaceae
  member of:  division_Pteridophyta
  supertype:  family  (biology) a taxonomic group containing one or more genera; "sharks belong to the fish family"
     supertype:  taxonomic_group__taxonomicgroup__taxon  animal or plant group having natural relations
        supertype:  biological_group  a group of plants or animals
           supertype:  group__grouping  any number of entities (members) considered as a unit
              supertype:  collection  something gathering separated things (entities/situations)
                 supertype:  divisible_entity__divisibleentity  many classifications under this category are application-dependant
                    supertype:  entity  something that can be "involved" in a situation
                       supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                    supertype:  divisible_thing__divisiblething
                       supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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