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Answer for the clue "Oak ferns in some classification systems included in genus Thelypteris ", 12 letters:
gymnocarpium

Word definitions for gymnocarpium in dictionaries

Wikipedia Word definitions in Wikipedia
Gymnocarpium is a small genus of ferns, called oak ferns . It was once placed with various other groups, including the dryopteroid ferns and the athyrioid ferns. Cladistic analysis has demonstrated that Gymnocarpium and Cystopteris form a natural but relatively ...