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  1. By: Kelloff, Carol Lynn, - Skog, Judith E. - Adamkewicz, Laura - Werth, Charles R
    Type: Article
    In: American fern journal
    Volume: 92
    Date: 2002
    Page Range: 185--213
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Barrington, David S. (David Stanley) - Haufler, Christopher H - Werth, Charles R
    Type: Article
    In: American fern journal
    Volume: 79
    Date: 1989
    Page Range: 55--64
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Stevens, Richard D. - Werth, Charles R
    Type: Article
    In: American fern journal
    Volume: 89
    Date: 1999
    Page Range: 221--231
    Publication Info: [Washington, etc.] American Fern Society
  4. By: Werth, Charles R - Haskins, Melanie L - Hulburt, Akke
    Type: Article
    In: American fern journal
    Volume: 75
    Date: 1985
    Page Range: 128--132
    Publication Info: [Washington, etc.] American Fern Society
  5. By: Eshbaugh, William Hardy, - Werth, Charles R - Wilson, Thomas K
    Type: Article
    In: Phytologia
    Volume: 45
    Issue: 4
    Date: 1980
    Page Range: 356
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke