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  1. By: Johnson, Marc T. J. - Rothfels, Carl J
    Type: Article
    In: The Canadian field-naturalist
    Volume: 115
    Issue: 2
    Date: 2001
    Page Range: 229--233
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Leon, Blanca - Rothfels, Carl J - Arakaki, Mónica - Young, Kenneth R - Pryer, Kathleen M. (Kathleen Mary)
    Type: Article
    In: American fern journal
    Volume: 103
    Date: 2013
    Page Range: 40--48
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Rothfels, Carl J
    Type: Article
    In: The Canadian field-naturalist
    Volume: 118
    Issue: 4
    Date: 2004-10-01
    Page Range: 612--615
    Publication Info: Ottawa Ottawa Field-Naturalists' Club