#genus_Polystichum__Polystichum  small to medium-sized terrestrial ferns especially holly ferns; in some classification systems placed in Polypodiaceae
  member:  #Christmas_fern  #holly_fern  #soft_shield_fern
  member of:  #family_Dryopteridaceae
  supertype:  #fern_genus  genera of ferns and fern allies
     supertype:  #genus__genu  (biology) taxonomic group containing one or more species
        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:  pm#collection  something gathering separated things (entities/situations)
                    supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  pm#entity  something that can be "involved" in a situation
                          supertype:  pm#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:  pm#divisible_thing__divisiblething
                          supertype:  pm#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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