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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Lorence, David
    Type: Article
    In: Acta Botánica Mexicana
    Volume: 88
    Date: 2009
    Page Range: 73--79
    Publication Info: México, Instituto de Ecología, A C, 1988-
  2. By: Ebihara, Atsushi - Nitta, Joel H - Lorence, David - Dubuisson, Jean-Yves
    Type: Article
    In: American fern journal
    Volume: 99
    Date: 2009
    Page Range: 200--206
    Publication Info: [Washington, etc.] American Fern Society