Abstract
Nearly 103 species of Sphaeropteris are distributed in tropical area, of which three species are indigenous to China. Our previous molecular study of the genus in China showed that there is an undescribed species from Guangxi province which could be originated from natural hybridization. In this study, we carried out further morphological studies on the species of Sphaeropteris in China, and assessed the status of the new species. Here, we described and illustrated the new species as S. guangxiensis Y.F. Gu & Y.H. Yan.
References
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<p>Smith, A.R., Pryer, K.M., Schuettpelz, E.K.P., Schneider, H. & Wolf, P.G. (2006) A classification for extant ferns. <em>Taxon</em> 55: 705–731. https://doi.org/10.2307/25065646</p>
<p>Sprengel, C.P.J. (1826) <em>Systema Vegetabilium, edition decimal sexta. Vol. 3</em>. Subntibus Librariae Dieterichianae, Gottingae, 936 pp.</p>
<p>Tagawa, M. (1966) Polypodiaceae.<em> In: </em>Hara, H. (Ed.) <em>Flora of Eastern Himalaya</em>. University of Tokyo, Tokyo, 742 pp.</p>
<p>Tryon, R.M. (1970) The classification of the Cyatheaceae. <em>Contributions from the Gray Herbarium of Harvard University</em> 200: 3–53<em>.</em></p>
<p>Yan, Y.-H., Zhang, X.-C. & Ma, K.-P. (2013) <em>Pteridophytes in China: diversity and distribution</em>. Science Press, Beijing, China, pp. 146–147.</p>
<p>Zhang, J.-L., Bai, S.-M. & Wang, R.-X. (2017) Observation of Guangxi Cyatheaceae spores under scanning electron microscope and its systematic significance. <em>Popular Science & Technology</em> 19: 75–77.</p>
<p>Zhang, X.-C. & Nishida, H. (2013) Cyatheaceae.<em> In: </em>Wu, Z.Y. & Raven, P.H. (Eds.)<em> Flora of China</em>, <em>Vols. 2–3</em>. Science Press and Missouri Botanical Garden Press, Beijing and Saint Louis, pp. 134–138.</p>
<p>Bernhardi, D.I.I. (1801) Tentamen alterum filices in genera redigendi. <em>Journal für die Botanik</em> <em>(Schrader)</em> 1800 : 121–136.</p>
<p>Blume, C.L. (1828) <em>Enumeratio plantarum Javae et insularum adjacentium minus cognitarum vel novarum ex herbariis Reinwardtii</em>,<em> Kuhlii, Hasseltii et Blumii. Fasc. 2.</em>. Lugduni Batavorum, Leiden, 274 pp. https://doi.org/10.5962/bhl.title.44901</p>
<p>Brown, R. (1810) <em>Prodromus Florae Novae Hollandiae et Insulae Van-Diemen, etc.</em> Leornard Schrag, Nuremberg, 590 pp.</p>
<p>Cao, J.-G., Wang, Q.-X. & Yu, J. (2007) Spore morphology of ferns from China VII. Cyatheaceae. <em>Acta Botanica Yunnanica</em> 29: 7–12. https://doi.org/10.1016/S1872-2075(07)60055-7</p>
<p>Ching, R.-C. & Wang, C.-H. (1959) Materials for the Pteridophytic Flora of Hainan. <em>Acta Phytotaxonomica Sinica</em> 8: 125–171.</p>
<p>Ching, R.-C. & Wang, C.-H. (1964) Additional materials for the Pteridophytic Flora of Hainan. <em>Acta Phytotaxonomica Sinica</em> 9: 345–373.</p>
<p>Conant, D.S., Raubeson, L.A., Attwood, D.K. & Stein, D.B. (1995) The relationships of Papuasian Cyatheaceae to New World tree ferns. <em>American Fern Journal</em> 85: 328–340. https://doi.org/10.2307/1547813</p>
<p>Copeland, E.B. (1929) The oriental genera of Polypodiaceae. <em>University of California Publications in Botany</em> 16: 45–128.</p>
<p>Holttum, R.E. (1957) The scales of Cyatheaceae. (with special reference to the genus <em>Schizocaena</em> J. Sm.). <em>Kew Bulletin</em> 12 : 41–45. https://doi.org/10.2307/4109099</p>
<p>Hooker, W.J. (1844) <em>Species filicum</em>:<em> being descriptions of the known ferns Polypodieae-acrosticheae, </em>William Pamplin, London, 245 pp.</p>
<p>Korall, P., Conant, D.S., Metzgar, J.S., Schneider, H. & Pryer, K.M. (2007) A molecular phylogeny of scaly tree ferns (Cyatheaceae). <em>American Journal of Botany</em> 94 : 873–886. https://doi.org/10.3732/ajb.94.5.873</p>
<p>Korall, P. & Pryer, K.M. (2014) Global biogeography of scaly tree ferns (Cyatheaceae): evidence for Gondwanan vicariance and limited transoceanic dispersal. <em>Journal of Biogeography</em> 41 : 402–413. https://doi.org/10.1111/jbi.12222</p>
<p>Kramer, K.U. & Green, P.S. (1990) Pteridophytes and Gymnosperms,<em> In:</em> Kubitzki, K. & Green, P.S. (Eds.) <em>The families and genera of vascular plants</em>. <em>Vol. 1</em>. Springer-Verlag, Berlin, pp. 69–74.</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. <em>Vol. 2</em>. Imprensis Laurentii Salvii, Homiae, 1200 pp.</p>
<p>Linnaeus, C. (1763) <em>Species Plantarum</em>, <em>Editio Secunda 2</em>. Imprensis Direct. Laurentii Salvii, Holmiae, 1864 pp.</p>
<p>McClure, F.A. (1936) The Chinese species of <em>Schizostachyum</em>.<em> Lingnan Science Journal</em> 15: 639–643.</p>
<p>Morigengaowa, Shang, H., Liu, B.-D., Kang, M. & Yan, Y.-H. (2019) One or more species? GBS sequencing and morphological traits evidence reveal species diversification of <em>Sphaeropteris brunoniana</em> in China. <em>Biodiversity Science</em> 29: 1196–1204. https://doi.org/10.17520/biods.2019146</p>
<p>Müller, A.J. (1865) <em>Linnaea</em>; <em>Ein Journal für die Botanik in ihrem ganzen Umfange</em>. Commission bei C. A. Schwetschke and Soha, Braunschweig, 752 pp.</p>
<p>Nong, D.-X., Jiang, R.-H., Wu, L. & Xu, W.-B. (2012) <em>Sphaeropteris</em>, a newly recorded genus of tree ferns from Guangxi. <em>Guihaia</em> 32: 12–14. https://doi.org/10.3969/j.issn.1000-3142.2012.01.004</p>
<p>PPG I (2016) A community-derived classification for extant lycophytes and ferns. <em>Journal of</em> <em>Systematics & Evolution</em> 54: 563–603. https://doi.org/10.1111/jse.12229</p>
<p>Smith, J.E. (1793) <em>Mémoires de l’Académie Royale des Sciences</em>. <em>Vol. 5</em>. Imprimeur Libraire de L’Académie, Turin, 422 pp.</p>
<p>Smith, A.R., Pryer, K.M., Schuettpelz, E.K.P., Schneider, H. & Wolf, P.G. (2006) A classification for extant ferns. <em>Taxon</em> 55: 705–731. https://doi.org/10.2307/25065646</p>
<p>Sprengel, C.P.J. (1826) <em>Systema Vegetabilium, edition decimal sexta. Vol. 3</em>. Subntibus Librariae Dieterichianae, Gottingae, 936 pp.</p>
<p>Tagawa, M. (1966) Polypodiaceae.<em> In: </em>Hara, H. (Ed.) <em>Flora of Eastern Himalaya</em>. University of Tokyo, Tokyo, 742 pp.</p>
<p>Tryon, R.M. (1970) The classification of the Cyatheaceae. <em>Contributions from the Gray Herbarium of Harvard University</em> 200: 3–53<em>.</em></p>
<p>Yan, Y.-H., Zhang, X.-C. & Ma, K.-P. (2013) <em>Pteridophytes in China: diversity and distribution</em>. Science Press, Beijing, China, pp. 146–147.</p>
<p>Zhang, J.-L., Bai, S.-M. & Wang, R.-X. (2017) Observation of Guangxi Cyatheaceae spores under scanning electron microscope and its systematic significance. <em>Popular Science & Technology</em> 19: 75–77.</p>
<p>Zhang, X.-C. & Nishida, H. (2013) Cyatheaceae.<em> In: </em>Wu, Z.Y. & Raven, P.H. (Eds.)<em> Flora of China</em>, <em>Vols. 2–3</em>. Science Press and Missouri Botanical Garden Press, Beijing and Saint Louis, pp. 134–138.</p>