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Answer for the clue "Constituting the order Marattiales chiefly tropical eusporangiate ferns with gigantic fronds ", 12 letters:
marattiaceae

Word definitions for marattiaceae in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Marattiaceae \Marattiaceae\ prop. n. The natural family of ferns coextensive with the order Marattiales , consisting of chiefly tropical eusporantiate ferns with gigantic fronds. Syn: family Marattiaceae .

Wikipedia Word definitions in Wikipedia
Class Marattiopsida is a group of ferns containing a single order, Marattiales , and family, Marattiaceae . with six extant genera and a total of ca 135 known species. Class Marattiopsida diverged from other ferns very early in their evolutionary history ...