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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Moran, Robbin Craig, - Tryon, Alice F. - Lugardon, Bernard
    Type: Article
    In: American fern journal
    Volume: 81
    Date: 1991
    Page Range: 108--108
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Grauvogel-Stamm, Léa - Lugardon, Bernard
    Type: Article
    In: American fern journal
    Volume: 91
    Date: 2001
    Page Range: 115--149
    Publication Info: [Washington, etc.] American Fern Society