#order_Psilophytales__Psilophytales  Paleozoic simple dichotomously branched plants of Europe and eastern Canada including the oldest known vascular land plants
  supertype:  #plant_order__plantorder  the order of plants
  member of:  #division_Pteridophyta
  member:  #psilophyte  any plant of the order Psilophytales: a savannah plant
  member:  #family_Psilophytaceae__Psilophytaceae  Paleozoic plants
     member:  #genus_Psilophyton  type genus of the Psilophytaceae: genus of small wiry herbaceous Paleozoic plants with underground rhizomes and apical sporangia
        member:  #psilophyton  any plant or fossil of the genus Psilophyton
  member:  #family_Rhyniaceae__Rhyniaceae  primitive plants of the Paleozoic
     member:  #genus_Rhynia__Rhynia  type genus of the Rhyniaceae; small leafless dichotomously branching fossil plants with terminal sporangia and smooth branching rhizomes
     member:  #genus_Horneophyton__Horneophyton  Devonian fossil plant considered one of the earliest forms of vascular land plants; similar to genus Rhynia but smaller

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