#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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