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  1. By: Benton, Fran - Brodo, Irwin M. (Irwin Murray), - Richardson, David H. S
    Type: Article
    In: The Canadian field-naturalist
    Volume: 91
    Issue: 3
    Date: 1977
    Page Range: 305--309
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Cameron, Robert - Richardson, David H. S
    Type: Article
    In: Opuscula philolichenum
    Volume: 3
    Date: 2006
    Page Range: 5--14
    Publication Info: Philadelphia J. Lendemer 2004-