#aquatic_fern__aquaticfern__water_fern__waterfern  ferns that grow in water
  supertype:  #fern  any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
  subtype:  #clover_fern__pepperwort  any of several water ferns of the genus Marsilea having four leaflets
     subtype:  #common_nardoo__nardoo__nardo__Marsilea_drummondii  Australian clover fern
     subtype:  #water_clover__waterclover__Marsilea_quadrifolia  water fern of Europe and Asia and the eastern United States distinguished by four leaflets resembling clover leaves
  subtype:  #pillwort__Pilularia_globulifera  European water fern found around margins of bodies of water or in wet acid soil having small globose sporocarps
  subtype:  #regnellidium__Regnellidium_diphyllum  small latex-containing aquatic fern of southern Brazil
  subtype:  #floating-moss__Salvinia_rotundifolia__Salvinia_auriculata  free-floating aquatic ferns
  subtype:  #mosquito_fern__floating_fern__Carolina_pond_fern__Azolla_caroliniana  small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
  subtype:  #floating_fern__water_sprite__watersprite__ceratopterispteridioide  aquatic fern of tropical America often used in aquariums
  subtype:  #Ceratopteris_thalictroides__floating_fern  pantropical aquatic fern

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