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  1. By: Morrow, Angela C - Dute, Roland R
    Type: Article
    In: American fern journal
    Volume: 92
    Date: 2002
    Page Range: 10--19
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Hansen, Curtis J. - Dute, Roland R
    Type: Article
    In: Evansia
    Volume: 22
    Issue: 3
    Date: 2005
    Page Range: 110--117
    Publication Info: Springfield, Mo American Bryological and Lichenological Society c1984-