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|Noun||1.||Rhyniaceae - primitive plants of the Paleozoic|
fern family - families of ferns and fern allies
order Psilophytales, Psilophytales - Paleozoic simple dichotomously branched plants of Europe and eastern Canada including the oldest known vascular land plants
genus Rhynia, Rhynia - type genus of the Rhyniaceae; small leafless dichotomously branching fossil plants with terminal sporangia and smooth branching rhizomes