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  1. By: Handfield, Louis - Handfield, Daniel
    Type: Article
    In: ZooKeys
    Volume: 149
    Date: 2011
    Page Range: 5-15
    Publication Info: Sofia, Bulgaria Pensoft Publishers
    Subjects: Christmas fern  Crambidae  Dryopteridaceae  eastern North America  Herpetogramma  Polystichum  taxonomy