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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ollgaard, Benjamin
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 79
    Date: 1992
    Page Range: 687--717
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Ollgaard, Benjamin
    Type: Article
    In: American fern journal
    Volume: 79
    Date: 1989
    Page Range: 151--154
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Ollgaard, Benjamin
    Type: Article
    In: American fern journal
    Volume: 72
    Date: 1982
    Page Range: 53--55
    Publication Info: [Washington, etc.] American Fern Society
  4. By: Peck, James H - Ollgaard, Benjamin - Tind, Kirsten
    Type: Article
    In: American fern journal
    Volume: 83
    Date: 1993
    Page Range: 134--134
    Publication Info: [Washington, etc.] American Fern Society