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  1. By: McVaugh, Rogers - Koptur, Suzanne
    Type: Article
    In: Contributions from the University of Michigan Herbarium
    Volume: 11
    Date: 1978
    Page Range: 298--300
    Publication Info: Ann Arbor, University Herbarium, University of Michigan, 1939-
  2. By: Koptur, Suzanne - Lee, Mary Ann B
    Type: Article
    In: American fern journal
    Volume: 83
    Date: 1993
    Page Range: 60--66
    Publication Info: [Washington, etc.] American Fern Society