Asplenium ruprechtii
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Asplenium ruprechtii, which goes by the common name Asian walking fern, is a rare, hardy, low-lying fern native to East Asia. It is a close relative of Asplenium rhizophyllum[1] (syn: Camptosorus rhizophyllus[1]) which is found in North America and also goes by the common name of walking fern.[2] The species should not be confused with Asplenium sibiricum which is a synonym of Diplazium sibiricum.
Description
The name walking fern was derived from the way the fern spreads. The underside of each leaf contain sori, and when the tip of the leaf touches the ground, new plantlets sprout, creating a "walking" effect.
The evergreen, undivided, slightly leathery leaves are triangular and taper to a thin point. Sori, the spore-bearing structures, are distributed in clusters along the veins on the underside of the leaves. The plant can be found in the shady areas of limestone ledges and in limy forest places. Asplenium ruprechtii is smaller than its relative, Asplenium rhizophyllum, and usually has cuneate bases to its fronds, whereas A. rhizophyllum usually has cordate frond bases.
Taxonomy
A global phylogeny of Asplenium published in 2020 divided the genus into eleven clades,Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. which were given informal names pending further taxonomic study. A. ruprechtii belongs to the "A. cordatum subclade" of the "Schaffneria clade".Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. The Schaffneria clade has a worldwide distribution, and members vary widely in form and habitat.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. There is no clear morphological feature that unites the A. cordatum subclade; the sister species of A. ruprechtii is A. rhizophyllum, which shares an undivided leaf blade and a proliferating tip, while the other three species are scaly spleenworts of dry habitats in Africa and the Middle East.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
Hybrids
A. ruprechtii hybridizes with several other spleenworts in east Asia. With the diploid A. incisum, it forms A. castaneoviride, which encompasses both the diploid F1 hybrid and a fertile allotetraploid derived from it.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. The hybrid A. × bimixtum contains a genomic contribution from A. quadrivalens as well as A. ruprechtii and A. incisum, and occurs as a tetraploid.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. A. ruprechtii hybridizes with the diploid A. sarelii to form A. × kitazawae, which comprises a diploid F1 hybrid and its fertile allotetraploid derivative,Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. and with A. pekinense, an autotetraploid formed from A. sarelii, to form the triploid A. × uiryeongse.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. In Japan it hybridizes with A. coenobiale to form A. × tosaense, and with A. tenuicaule to form A. × akaishiense.
References
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- ^ a b Page Module:Citation/CS1/styles.css has no content.Wagner, Warren H. Jr.; Moran, Robbin C.; Werth, Charles R. (1993). "Asplenium rhizophyllum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico. Vol. 2: Pteridophytes and Gymnosperms. New York and Oxford: Oxford University Press. Retrieved 2007-11-21.
- ^ Encyclopædia Britannica Online
- Page Module:Citation/CS1/styles.css has no content.Lee, Chang Shook; Yeau, Sung Hee; Chung, Kyong-Sook (2019). "Exploring natural hybridizations among Asplenium ruprechtii and related taxa in Korea". Korean Journal of Plant Taxonomy. 49 (2): 127–139. doi:10.11110/kjpt.2019.49.2.127.
- Page Module:Citation/CS1/styles.css has no content.Xu, Ke-Wang; Zhang, Liang; Rothfels, Carl J.; Smith, Alan R.; Viane, Ronald; Lorence, David; Wood, Kenneth R.; Chen, Cheng-Wei; Knapp, Ralf; Zhou, Lin; Lu, Ngan Thi; Zhou, Xin-Mao; Wei, Hong-Jin; Fan, Qiang; Chen, Su-Fang; Cicuzza, Daniele; Gao, Xin-Fen; Li, Wen-Bo; Zhang, Li-Bing (2020). "A global plastid phylogeny of the fern genus Asplenium (Aspleniaceae)". Cladistics. 36 (1): 22–71. doi:10.1111/cla.12384. PMID 34618950. S2CID 201197385.
Sources
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