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  1. By: Taylor, W. Carl, - Wagner, Warren H.‏ (Warren Herbert),‏ - Hobdy, Robert W - Warshauer, F. R.
    Type: Article
    In: American fern journal
    Volume: 83
    Date: 1993
    Page Range: 67--70
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Wagner, Warren H.‏ (Warren Herbert),‏ - Wagner, F. S. (Florence Signaigo), - Palmer, Daniel D - Hobdy, Robert W
    Type: Article
    In: Contributions from the University of Michigan Herbarium
    Volume: 22
    Date: 1999
    Page Range: 135--187
    Publication Info: Ann Arbor, University Herbarium, University of Michigan, 1939-