References
Liverworts and Hornworts of Southern Michigan. By Howard Crum. University of Michigan Herbarium, North University Building, Ann Arbor, MI 48109-1057. ISBN 0-9620733-1-8. 1991. 233 pp. US orders $18, non-US orders $20 (cloth).
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Thiers, B.M. Liverworts and hornworts of Southern Michigan. Brittonia 43, 277–278 (1991). https://doi.org/10.2307/2807291
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DOI: https://doi.org/10.2307/2807291