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  1. By: Frahm, Jan-Peter,
    Type: Article
    In: Evansia
    Volume: 11
    Issue: 3
    Date: 1994
    Page Range: 95--99
    Publication Info: Springfield, Mo American Bryological and Lichenological Society c1984-
  2. By: Peck, James H - Frey, Wolfgang, - Frahm, Jan-Peter, - Fischer, E - Lobin, W
    Type: Article
    In: American fern journal
    Volume: 85
    Date: 1995
    Page Range: 67--68
    Publication Info: [Washington, etc.] American Fern Society