↑ Nakai,T.(1943).“Ord. Fam. Trib. Nov.”.A List of Prof. Nakai's Papers with Indices to Names of Plants and Plant-Groups Published as New to Science by Him.Tokyo.p.201 Posthumously published
↑ Wolfgang Frey, Eberhard Fischer, Michael Stech: Bryophytes and seedless Vascular Plants. In: Wolfgang Frey (Hrsg.): Syllabus of Plant Families - A. Engler's Syllabus der Pflanzenfamilien. 13. Auflage. Bd. 3, Borntraeger, Berlin/Stuttgart 2009, ISBN 978-3-443-01063-8, S. 68.
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