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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Darling, Thomas
    Type: Article
    In: American fern journal
    Volume: 52
    Date: 1962
    Page Range: 137--148
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Darling, Thomas
    Type: Article
    In: American fern journal
    Volume: 56
    Date: 1966
    Page Range: 49--55
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Darling, Thomas
    Type: Article
    In: American fern journal
    Volume: 54
    Date: 1964
    Page Range: 197--205
    Publication Info: [Washington, etc.] American Fern Society