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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rugg, Harold Goddard
    Type: Article
    In: American fern journal
    Volume: 12
    Date: 1922
    Page Range: 128--130
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Rugg, Harold Goddard
    Type: Article
    In: American fern journal
    Volume: 21
    Date: 1931
    Page Range: 71--73
    Publication Info: [Washington, etc.] American Fern Society