Hymenasplenium

Hymenasplenium
	Hymenasplenium cheilosorum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Aspleniaceae
Genus:	Hymenasplenium; Hayata
Type species
	Hymenasplenium unilaterale; (Lam.) Hayata. 1927
Synonyms
	Asplenium section Hymenasplenium (Hayata 1927) Iwatsuki 1975; Asplenium (Hymenasplenium) (Hayata 1927) Bir 1998; Boniniella Hayata 1927; Asplenium series Unilateralia Ching & Wu 1989;

Hymenasplenium is one of three genera of ferns in the Aspleniaceae (spleenwort family), in the eupolypods II clade of the order Polypodiales.^[1]^[2] The others are Hemidictyum and Asplenium. Hymenasplenium was segregated because it is a natural grouping with differing rhizome morphology – dorsiventral v. radial for the rest of Asplenium, differing chromosome count – x=39 v. x=36 for the rest of Asplenium, and a clear monophyletic grouping based on genetic analysis. It was confirmed as a sister group to Asplenium in a 2015 molecular study of the genera.^[3]

Phylogeny

Phylogeny from Fern Tree of Life^[4]^[5]

Other species include:

Hymenasplenium

	H. delitescens (Maxon) Regalado & Prada

	H. hoffmannii (Hieronymus) Regalado & Prada

	H. laetum (Swartz) Regalado & Prada

	H. praestans (Copeland) Testo, Riibe & Sundue

H. triquetrum (N.Murak. & Moran) Regalado & Prada

	H. riparium (Liebmann) Regalado & Prada

	H. volubile (N.Murak. & Moran) Regalado & Prada

H. phamhoanghoi Zhang, Xu & Luong

	H. excisum (Presl) S.Linds. 2009 (Scalloped spleenwort)

	H. obscurum (Blume) Tagawa

H. tholiforme Zhang, Ju & Xu

	H. pseudobscurum Viane

	H. obtusidentatum Chang & Zhang

H. cheilosorum

H. amoenum (Presl ex Mettenius) Ranil

	H. filipes (Copeland) Sugim.

	H. obliquissimum (Hayata) Sugim.

H. szechuanense (Ching) Viane & Dong

H. furfuraceum (Ching) Viane & Dong

	H. latidens (Ching) Viane & Dong

	H. quercicola (Ching) Viane & Dong

	H. subnormale (Copeland) Nakaike

	H. wildii (Bail.) Ohlsen

H. distans Zhang, Xu & Zhang

H. apogamum (N.Murak. & Hatan.) Nakaike

H. ngheanense Zhang, Xu & Lu

	H. laterepens N.Murak. & Cheng ex Chang & Hori

	H. unilaterale (Lam.) Hayata

H. cardiophyllum (Hance) Nakaike

H. quangnamense Zhang, Xu & Zhang

	H. hastifolium Xu, Zhang & Liao

	H. pubirhizoma (Ching & Liu) Xu & Zhang

H. chingii Xu, Zhang & Liao

H. wangpeishanii Zhang & Xu

	H. hondoense (N.Murak. & Hatan.) Nakaike

	H. speluncicola Zhang, Xu & He

H. andohahelense Viane
H. antsirananense Viane
H. basiscopicum (Moran & Sundue) Regalado & Prada
H. changputungense (Ching) Viane & Dong
H. denticulatum Xu, Zhang & Liao
H. ×doanyense Viane
H. ×excurum Viane
H. guineense Zhang, Liao & Xu
H. ikenoi (Makino) Viane
H. ×incisoserratum (Rosenstock)
H. inthanonense N.Murak. & J.Yokoy.
H. kenyense Zhang, Xu & Kamau
H. kinabaluense Zhang & Xu
H. madagascariense Zhang, Liao & Xu
H. neocaledonicum Zhang & Xu
H. nigricostatum Zhang & Xu
H. obtusifolium (von Linné) Regalado & Prada
H. ofeliae (Salgado) Barcelona & Pelser 2021
H. oligosorum Zhang, Xu & Lorence 2019
H. ortegae (N.Murak. & Moran) Regalado & Prada
H. perriei Zhang & Xu 2018
H. purpurascens (Mettenius ex Kuhn) Regalado & Prada
H. queenslandicum Zhang & Xu 2019
H. repandulum (Kunze) Regalado & Prada
H. rivulare (Fraser-Jenkins) Viane & Dong
H. sabahense Zhang, Xu & Chen
H. samoaense Zhang, Xu & Wood
H. sinense Xu, Zhang & Liao
H. solomonense Zhang & Xu
H. trapeziforme (Wallich ex Roxburgh)
H. vanuatuense Zhang & Xu
H. wusugongii Zhang, Liao & Xu

References

^ Alan R. Smith; Kathleen M. Pryer; Eric Schuettpelz; Petra Korall; Harald Schneider; Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646. Archived from the original (PDF) on February 26, 2008.
^ Maarten J. M. Christenhusz; Xian-Chun Zhang; Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa. 19: 7–54. doi:10.11646/phytotaxa.19.1.2.
^ Ohlsen DJ, Perrie LR, Shepherd LD, Brownsey PJ, Bayly MJ (2015). "Phylogeny of the fern family Aspleniaceae in Australasia and the south-western Pacific". Australian Systematic Botany. 27 (6): 355–71. doi:10.1071/sb14043.
^ Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi:10.3389/fpls.2022.909768. PMC 9449725. PMID 36092417.
^ "Tree viewer: interactive visualization of FTOL". FTOL v1.7.0 (GenBank release 261). 2024. Retrieved 1 May 2025.

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[Smith-2006-1] Alan R. Smith; Kathleen M. Pryer; Eric Schuettpelz; Petra Korall; Harald Schneider; Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646. Archived from the original (PDF) on February 26, 2008.

[Christenhusz-2011-2] Maarten J. M. Christenhusz; Xian-Chun Zhang; Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa. 19: 7–54. doi:10.11646/phytotaxa.19.1.2.

[Ohlsen2015-3] Ohlsen DJ, Perrie LR, Shepherd LD, Brownsey PJ, Bayly MJ (2015). "Phylogeny of the fern family Aspleniaceae in Australasia and the south-western Pacific". Australian Systematic Botany. 27 (6): 355–71. doi:10.1071/sb14043.

[4] Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi:10.3389/fpls.2022.909768. PMC 9449725. PMID 36092417.

[5] "Tree viewer: interactive visualization of FTOL". FTOL v1.7.0 (GenBank release 261). 2024. Retrieved 1 May 2025.

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