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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pullen, Thomas M
    Type: Article
    In: American fern journal
    Volume: 56
    Date: 1966
    Page Range: 37--37
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Pullen, Thomas M
    Type: Article
    In: Rhodora
    Volume: 69
    Date: 1967
    Page Range: 61--62
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],