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  1. By: Ladd, Douglas - Wilhelm, Gerould S. - Harris, Richard C.
    Type: Article
    In: Evansia
    Volume: 11
    Issue: 4
    Date: 1994
    Page Range: 131--138
    Publication Info: Springfield, Mo American Bryological and Lichenological Society c1984-
  2. By: Ladd, Douglas - Thomas, Justin R.
    Type: Article
    In: Phytoneuron
    Volume: 2015-12
    Date: 2015
    Page Range: 1--274
    Publication Info: Fort Worth, TX, Guy L. Nesom,
  3. By: Zollner, Douglas - Macroberts, Michael H - Macroberts, Barbara R - Ladd, Douglas
    Type: Article
    In: SIDA, contributions to botany
    Volume: 21
    Date: 2005
    Page Range: 1781--1791
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  4. By: Ladd, Douglas - Morse, Caleb A
    Type: Article
    In: Opuscula philolichenum
    Volume: 11
    Date: 2012
    Page Range: 60--63
    Publication Info: Philadelphia J. Lendemer 2004-
  5. By: Harris, Richard C. - Ladd, Douglas
    Type: Article
    In: Opuscula philolichenum
    Volume: 5
    Date: 2008
    Page Range: 29--42
    Publication Info: Philadelphia J. Lendemer 2004-
  6. By: Ladd, Douglas - Wilhelm, Gerould S.
    Type: Article
    In: Lichenographia Thomsoniana : North American lichenology in honor of John W. Thomson
    Date: 1998
    Page Range: 89--104
    Publication Info: Ithaca, NY, Mycotaxon, Ltd, 1998
  7. By: Ladd, Douglas - Harris, Richard C. - Buck, William R.,
    Type: Article
    In: Opuscula philolichenum
    Volume: 6
    Date: 2009
    Page Range: 81--86
    Publication Info: Philadelphia J. Lendemer 2004-
  8. By: Harris, Richard C. - Ladd, Douglas
    Type: Article
    In: Opuscula philolichenum
    Volume: 4
    Date: 2007
    Page Range: 57--68
    Publication Info: Philadelphia J. Lendemer 2004-