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  1. By: Hansen, Gayle I.
    Type: Article
    In: Occasional papers of the Farlow Herbarium of Cryptogamic Botany
    Volume: 12
    Date: 1977
    Page Range: 1--22
    Publication Info: Cambridge, Mass, Harvard University, Farlow Herbarium of Cryptogamic Botany,
  2. By: Hansen, Gayle I.
    Type: Article
    In: Occasional papers of the Farlow Herbarium of Cryptogamic Botany
    Volume: 12
    Date: 1977
    Page Range: 23--34
    Publication Info: Cambridge, Mass, Harvard University, Farlow Herbarium of Cryptogamic Botany,