Hymenasplenium

Hymenasplenium
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Polypodiopsida
Order:	Polypodiales
(unranked):	Eupolypods II
Family:	Aspleniaceae
Genus:	Hymenasplenium Hayata
Type species
Hymenasplenium unilaterale (Lam.) Hayata. 1927
Synonyms
Asplenium sect. Hymenasplenium (Hayata) K. Iwats. 1975

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]

Selected species

• Hymenasplenium basiscopicum
• Hymenasplenium cardiophyllum
• Hymenasplenium cheilosorum
• Hymenasplenium delitescens
• Hymenasplenium hoffmannii
• Hymenasplenium ikenoi
• Hymenasplenium laetum
• Hymenasplenium obtusifolium
• Hymenasplenium ortegae
• Hymenasplenium purpurascens
• Hymenasplenium repandulum
• Hymenasplenium riparium
• Hymenasplenium triquetrum
• Hymenasplenium unilaterale
• Hymenasplenium volubile

References

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. Archived from the original (PDF) on February 26, 2008.
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.
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#sthash.G4tUiO5M.dpuf.