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Takeuchi, W. 2013. Fern distributional records in <em>Christensenia</em> (Marattiaceae), <em>Dipteris</em> (Dipteridaceae), and <em>Rheopteris</em> (Pteridaceae) from the upper Sepik of Papua New Guinea. Phytotaxa. 142, 1 (Nov. 2013), 37–45. DOI:https://doi.org/10.11646/phytotaxa.142.1.4.