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Psilotatae

資料來源 : WordNet®

Psilotatae
     n : whisk ferns; comprising the family Psilotaceae or
         Psilotatae: vascular plants with no roots, partial if any
         leaf differentiation, and rudimentary spore sacs [syn: {Psilopsida},
          {class Psilopsida}, {class Psilotatae}]
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