Psilopsida
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs • Syn: class Psilopsida, Psilotatae, class Psilotatae • Hypernyms: class • Member Holonyms: Pteridophyta, division Pteridophyta • Member Meronyms: Psilotales, order Psilotales
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