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  1. By: Webster, Terry R
    Type: Article
    In: American fern journal
    Volume: 60
    Date: 1970
    Page Range: 1--6
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Webster, Terry R
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 79
    Date: 1992
    Page Range: 632--647
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  3. By: Webster, Terry R - Steeves, Taylor A
    Type: Article
    In: American fern journal
    Volume: 54
    Date: 1964
    Page Range: 189--196
    Publication Info: [Washington, etc.] American Fern Society