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Answer for the clue "Comprising the family Psilotaceae or Psilotatae vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs ", 10 letters:
psilopsida

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Word definitions for psilopsida in dictionaries

Wikipedia Word definitions in Wikipedia
Psilopsida may refer to: Psilotopsida or Psilopsida, a class of ferns in current classifications Psilophytopsida or Psilopsida, a now obsolete class used for a group of extinct plants