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| Dryopteris gaoligongensis Z.Y. Zuo, Jin Mei Lu & D.Z. Li, Zuo, Zhao, Du, Xiong, Lu et Li, 2022. 高黎贡山鳞毛蕨 || DOI: 10.1016/j.pld.2021.09.005 |
Highlights:
• We reconstruct the first phylogeny of Dryopteris sect. Diclisodon using combined plastid regions and nuclear gene AK1.
• A revision of Dryopteris sect. Diclisodon in China is proposed based on morphological and phylogenetic evidence.
• Phylogenetic studies confirm the distinctiveness of Dryopteris gaoligongensis, D. renchangiana, and D. sinonepalensis.
• Our study show that the morphological characteristics of the rhizome should be taken into more account in Dryopteris.
Abstract
Dryopteris sect. Diclisodon is a small section of ferns with about 12 species mainly distributed in East Asia. Here, we carried out morphological and phylogenetic analyses of this section. A new species from southwest China, D. gaoligongensis, is described and illustrated. Dryopteris gaoligongensis resembles D. indonesiana and D. sparsa, but differs by having a creeping rhizome and large 4-pinnate fronds. We also show that D. glabrior Ching & Z.Y. Liu is a distinct species; however, because it is a later homonym of D. glabrior Copel., it should be renamed D. renchangiana. We conclude that a species previously known as D. nitidula, also an illegitimate homonym, should be recognized with a new name, D. sinonepalensis. We resolve the phylogenetic position of D. yoroii as sister to other sampled species of D. sect. Diclisodon. Our phylogenetic analyses confirm the distinctiveness of D. gaoligongensis, D. renchangiana, and D. sinonepalensis. A key to species of D. sect. Diclisodon in China is provided.
Keywords: Dryopteris gaoligongensis, Dryopteris renchangiana, Dryopteris sect. Nephrocystis, Dryopteris sinonepalensis, Molecular phylogeny, Nomenclatural novelties
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| Dryopteris gaoligongensis Z.Y. Zuo, Jin Mei Lu & D.Z. Li. A. Habitat and well-developed fronds. B. 4-pinnate lower pinnae. C. The bipinnate-pinnatifid fronds in a young plant. D. Rhizome. E. Sori on ultimate pinnules. F. Scales. |
Dryopteris gaoligongensis Z.Y. Zuo, Jin Mei Lu & D.Z. Li, sp. nov.
高黎贡山鳞毛蕨
【gāo lí gòng shān lín máo jué】
Diagnosis: Dryopteris gaoligongensis is different from other species in D. sect. Diclisodon by being a large plant with a creeping rhizome. It is similar to some species of D. sect. Marginatae (e.g., D. subimpressa Loyal.) in leaf shape. However, it can be identified as a member of D. sect. Diclisodon by typical asymmetrical bases of pinnales, basiscopic pinnule of basal pair of pinnae elongated as pinnatifid.
Etymology: The specific epithet “gaoligongensis” refers to its type locality, the Gaoligong Mountains, on the border of Yunnan of China and Myanmar.
Zheng-Yu Zuo, Ting Zhao, Xin-Yu Du, Yun Xiong, Jin-Mei Lu and De-Zhu Li. 2022. A Revision of Dryopteris sect. Diclisodon (Dryopteridaceae) based on Morphological and Molecular Evidence with Description of A New Species. Plant Diversity. 44(2); 181-190. DOI: 10.1016/j.pld.2021.09.005
