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By: Johnson, Marc T. J. - Rothfels, Carl JType: ArticleIn: The Canadian field-naturalistVolume: 115Series:Issue: 2Date: 2001Page Range: 229--233Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Rothfels, Carl JType: ArticleIn: The Canadian field-naturalistVolume: 118Series:Issue: 4Date: 2004-10-01Page Range: 612--615Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Leon, Blanca - Rothfels, Carl J - Arakaki, Mónica - Young, Kenneth R - Pryer, Kathleen M. (Kathleen Mary)Type: ArticleIn: American fern journalVolume: 103Series:Issue:Date: 2013Page Range: 40--48Publication Info: [Washington, etc.] American Fern SocietySubjects: