#genus_Regnellidium  1 species of aquatic or semi-aquatic fern
  supertype:  #fern_genus  genera of ferns and fern allies
  member:  #regnellidium
  member of:  #family_Marsileaceae__Marsileaceae  clover ferns
     member of:  #class_Filicopsida__Filicopsida__Filicinae__class_Filicinae  ferns
        member of:  #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
           member of:  #kingdom_Plantae__Plantae__plant_kingdom__plantkingdom  taxonomic kingdom comprising all living or extinct plants

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