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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. http://www.ucmp.berkeley.edu/plants/pterophyta/pteridopsida.html Top/Science/Biology/Flora_and_Fauna/Plantae/Polypodiophyta