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  • †Cladoxylopsida
  • Psilotopsida
  • Equisetopsida (alias Sphenopsida)
  • Marattiopsida
  • Polypodiopsida (alias Pteridopsida, Filicopsida)
  • †Zygopteridales
  • †Stauropteridales
  • †Rhacophytales

The many classes of the fern.

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13y ago

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