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Calypogeia Raddi
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Damsholt, K. 2002. Ill. Fl. Nord. Liverw. Hornw. 837 pp. Kleinsteuber, Lund, Sweden.
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Doyle, W. T. & R. E. Stotler. 2006. Contributions toward a bryoflora of California III. Keys and annotated species catalogue for liverworts and hornworts. Madroño 53: 89–197.
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