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Family PYLAISIADELPHACEAE Goffinet & W. R. Buck Clastobryellina ceylonensis (Broth.) H. Akiyama (Arts 2005: 143, as Gammiella ceylonensis (Broth.) B. C. Tan & W. R. Buck). Isopterygium chryseolum Besch. R (Bescherelle 1880a: 314). Isopterygium citrinellum Renauld & Cardot E R (Renauld & Cardot 1905: 103). Isopterygium intortum (P. Beauv.) A. Jaeger M (Een 1997: 28). Isopterygium leiotheca Renauld & Cardot E R (Renauld & Cardot 1895: 134). Isopterygium molle Thér. E R (Thériot 1923: 461). Isopterygium radicans (Brid.) A. Jaeger E R (Bridel 1819: 185, as Hypnum radicans Brid.). Taxithelium lindbergii (A. Jaeger) Renauld & Cardot (Câmara 2011: 14). Taxithelium pseudoamoenum (Bél.) Renauld R (Bélanger 1834: 90, as Hypnum pseudoamoenum Bél.). Trachyphyllum borgenii (Renauld & Cardot) Broth. M (Ellis et al. 2018: 17). Trachyphyllum inflexum (Harv.) A. Gepp (Buck 1979: 385). Wijkia protensa (Renauld & Cardot) H. A. Crum R (Renauld & Cardot 1890: 183, as Rhaphidostegium protensum Renauld & Cardot).
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Wilding et al. (2026) studied this question.