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Answer for the clue "One of a number of families into which Polypodiaceae has been subdivided in some classification systems ", 16 letters:
dennstaedtiaceae

Word definitions for dennstaedtiaceae in dictionaries

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Dennstaedtiaceae is one of fifteen families in the order Polypodiales , the most derived families within monilophytes (ferns). It comprises 10 genera with ca 240 known species, including one of the world's most abundant fern, Pteridium aquilinum (bracken). ...