Accepted By:
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Frye, T. C. & L. Clark. 1937. Hepaticae of North America. Part I. Univ. Wash. Publ. Biol. 6: 1–162.
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Schuster, R. M. 1953. Boreal Hepaticae, a manual of the liverworts of Minnesota and adjacent regions. Amer. Midl. Naturalist 49: [i–v] 257–684.
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