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By: Pigg, Kathleen B - Rothwell, Gar WType: ArticleIn: PalaeontologyVolume: 28Series:Issue:Date: 1985Page Range: 545--553Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Pigg, Kathleen BType: ArticleIn: Annals of the Missouri Botanical GardenVolume: 79Series:Issue:Date: 1992Page Range: 589--612Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-Subjects:
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By: Pigg, Kathleen BType: ArticleIn: American fern journalVolume: 91Series:Issue:Date: 2001Page Range: 99--114Publication Info: [Washington, etc.] American Fern SocietySubjects: