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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Kruckeberg, Arthur R
    Type: Article
    In: American fern journal
    Volume: 54
    Date: 1964
    Page Range: 113--126
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Kruckeberg, Arthur R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 19
    Date: 1967
    Page Range: 126--129
    Publication Info: Berkeley, California Botanical Society,