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Marratiopsida (7) Polypodiopsida (458)
Marsileopsida (6) Salviniopsida (15)
Ophioglossopsida (6)  

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Introduction to the Ferns - The ferns are an ancient lineage of plants, dating back to at least the Devonian. They include three living groups - Marattiales, Ophioglossales, and leptosporangiate ferns - as well as a couple of extinct groups.
Natural Perspective - Ferns and Allies.
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