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]

List of species

As of July 2025^[update], the Checklist of Ferns and Lycophytes of the World recognized the sixty-seven species and three hybrids below.^[4]

Hymenasplenium amoenum (C.Presl ex Mett.) Ranil
Hymenasplenium andohahelense Viane
Hymenasplenium antsirananense Viane
Hymenasplenium apogamum (N.Murak. & Hatan.) Nakaike
Hymenasplenium basiscopicum (R.C.Moran & Sundue) L.Regalado & Prada
Hymenasplenium cardiophyllum (Hance) Nakaike
Hymenasplenium changputungense (Ching) Viane & S.Y.Dong
Hymenasplenium cheilosorum (Kunze ex Mett.) Tagawa
Hymenasplenium chingii K.W.Xu, Li Bing Zhang & W.B.Liao
Hymenasplenium delitescens (Maxon) L.Regalado & Prada
Hymenasplenium denticulatum K.W.Xu, Li Bing Zhang & W.B.Liao
Hymenasplenium distans Li Bing Zhang, K.W.Xu & Liang Zhang
Hymenasplenium excisum (C.Presl) S.Linds.
Hymenasplenium filipes (Copel.) Sugim.
Hymenasplenium furfuraceum (Ching) Viane & S.Y.Dong
Hymenasplenium guineense Li Bing Zhang, W.B.Liao & K.W.Xu
Hymenasplenium hastifolium K.W.Xu, Li Bing Zhang & W.B.Liao
Hymenasplenium hoffmannii (Hieron.) L.Regalado & Prada
Hymenasplenium hondoense (N.Murak. & Hatan.) Nakaike
Hymenasplenium hovenkampii K.W.Xu & Li Bing Zhang
Hymenasplenium ikenoi (Makino) Viane
Hymenasplenium inthanonense N.Murak. & J.Yokoy.
Hymenasplenium kenyense Li Bing Zhang, K.W.Xu & Kamau
Hymenasplenium kinabaluense Li Bing Zhang & K.W.Xu
Hymenasplenium laetum (Sw.) L.Regalado & Prada
Hymenasplenium latedens (Ching) Viane & S.Y.Dong
Hymenasplenium laterepens N.Murak. & X.Cheng ex Y.Fen Chang & K.Hori
Hymenasplenium madagascariense Li Bing Zhang, W.B.Liao & K.W.Xu
Hymenasplenium murakami-hatanakae Nakaike
Hymenasplenium neocaledonicum Li Bing Zhang & K.W.Xu
Hymenasplenium ngheanense Li Bing Zhang, K.W.Xu & N.T.Lu
Hymenasplenium nigricostatum Li Bing Zhang & K.W.Xu
Hymenasplenium obliquissimum (Hayata) Sugim.
Hymenasplenium obscurum (Blume) Tagawa
Hymenasplenium obtusidentatum Y.Fen Chang & G.Cheng Zhang
Hymenasplenium obtusifolium (L.) L.Regalado & Prada
Hymenasplenium ofeliae (Salgado) Barcelona & Pelser
Hymenasplenium oligosorum Li Bing Zhang, K.W.Xu & Lorence
Hymenasplenium ortegae (N.Murak. & R.C.Moran) L.Regalado & Prada
Hymenasplenium perriei Li Bing Zhang & K.W.Xu
Hymenasplenium phamhoanghoi Li Bing Zhang, K.W.Xu & T.T.Luong
Hymenasplenium praestans (Copel.) Testo, Riibe & Sundue
Hymenasplenium pseudobscurum Viane
Hymenasplenium pubirhizoma (Ching & Z.Y.Liu) K.W.Xu & Li Bing Zhang
Hymenasplenium purpurascens (Mett.) L.Regalado & Prada
Hymenasplenium quangnamense Li Bing Zhang, K.W.Xu & Liang Zhang
Hymenasplenium queenslandicum Li Bing Zhang & K.W.Xu
Hymenasplenium quercicola (Ching) Viane & S.Y.Dong
Hymenasplenium repandulum (Kunze) L.Regalado & Prada
Hymenasplenium riparium (Liebm.) L.Regalado & Prada
Hymenasplenium rivulare (Fraser-Jenk.) Viane & S.Y.Dong
Hymenasplenium sabahense Li Bing Zhang, K.W.Xu & C.W.Chen
Hymenasplenium samoaense Li Bing Zhang, K.W.Xu & K.R.Wood
Hymenasplenium sinense K.W.Xu, Li Bing Zhang & W.B.Liao
Hymenasplenium solomonense Li Bing Zhang & K.W.Xu
Hymenasplenium speluncicola Li Bing Zhang, K.W.Xu & H.He
Hymenasplenium subnormale (Copel.) Nakaike
Hymenasplenium szechuanense (Ching) Viane & S.Y.Dong
Hymenasplenium tholiforme Liang Zhang, W.B.Ju & K.W.Xu

Hymenasplenium trapeziforme (Wall. ex Roxb.) comb.ined., Asplenium trapeziforme Wall. ex Roxb.

Hymenasplenium triquetrum (N.Murak. & R.C.Moran) L.Regalado & Prada
Hymenasplenium unilaterale (Lam.) Hayata
Hymenasplenium vanuatuense Li Bing Zhang & K.W.Xu
Hymenasplenium volubile (N.Murak. & R.C.Moran) L.Regalado & Prada
Hymenasplenium wangpeishanii Li Bing Zhang & K.W.Xu
Hymenasplenium wildii (Bail.) D.J.Ohlsen
Hymenasplenium wusugongii Li Bing Zhang, W.B.Liao & K.W.Xu

Hybrids

Hymenasplenium × doanyense Viane
Hymenasplenium × excurum Viane

Hymenasplenium × incisoserratum (Rosenst.) comb.ined., Asplenium × incisoserratum (Rosenst.) N.Murak. & R.C.Moran

Phylogeny

Phylogeny from Fern Tree of Life^[5]^[6]

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

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.
^ Hassler, Michael. "Hymenasplenium". World Ferns. Retrieved 2025-07-15.
^ 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.

[CFLW-4] Hassler, Michael. "Hymenasplenium". World Ferns. Retrieved 2025-07-15.

[5] 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.

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

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