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| Cyrtomium adenotrichum Y. Nong & R.H. Jiang, in Nong, Lei, Zhao, Wei, Xu, Feng, Qu et Jiang, 2024. |
Abstract
Cyrtomium adenotrichum Y. Nong & R.H. Jiang (Dryopteridaceae), a new species from Guangxi, China, is described and illustrated. This new species is similar to C. nephrolepioides (Christ) Copel., C. obliquum Ching & K. H. Shing ex K. H. Shing, C. sinningense Ching & K. H. Shing ex K. H. Shing and C. calcis Liang Zhang, N.T.Lu & Li Bing Zhang in having erect rhizomes, dense, leathery lamina and rounded sori, but it can be easily distinguishable by its stipe sparsely glandular, base obvious oblique, basiscopic base truncate, acroscopic base auriculate or ovate.
Key words: Gully, limestone, Nandan, new species, taxonomy
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| Line drawing of Cyrtomium adenotrichum Y. Nong & R.H. Jiang A plant B scale C indusium (Drawn by Xin–Cheng Qu). |
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| Habitat of Cyrtomium adenotrichum Y. Nong & R.H. Jiang on cliffs at a gully (Photographed by You Nong). |
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| Cyrtomium adenotrichum Y. Nong & R.H. Jiang A, B plant C, D lamina (adaxially and abaxially view) E, F sori and indusia G, H terminal pinna (adaxially and abaxially view) I lateral pinnae (abaxially view, showing: margins entire and often slightly reflexed) J stipe (sparsely glandular) K curled leaves L, M, N scales O curled leaves (sparsely glandular) (Photographed and edited by You Nong). |
Cyrtomium adenotrichum Y.Nong & R.H.Jiang, sp. nov.
Chinese name: xiàn máo guàn zhòng (腺毛贯众)
Diagnosis: Cyrtomium adenotrichum is similar to C. nephrolepioides, C. obliquum, C. sinningense and C. calcis, but differs in its stipe sparsely glandular (vs. glabrous). In addition, it can be distinguished from C. sinningense by its scale margins fimbriate (vs. dentate), lateral pinnae 5–10 pairs (vs. 1–4 pairs), indusia margins dentate (vs. subentire); it can also be distinguished from C. nephrolepioides by its lateral pinnae 5–10 pairs (vs. 10–26 pairs), base obvious oblique (vs. cordate or sometimes obliquely cordate). It differs from C. obliquum by its scale margins fimbriate (vs. dentate), lateral pinnae 5–10 pairs (vs. 12–21 pairs), indusia margins dentate (vs. entire). It can be distinguished from C. calcis by its base obvious oblique (vs. cordate to hastate), lateral pinnae thin leathery (vs. thick leathery). Comparative morphological differences among all five species are presented in Table 1.
Etymology: The specific epithet refers to the stipe sparsely glandular of the new species.
You Nong, Li-Qun Lei, Zi-Yi Zhao, Gui-Yuan Wei, Chuan-Gui Xu, Bin Feng, Xin-Cheng Qu and Ri-Hong Jiang. 2024. Cyrtomium adenotrichum (Dryopteridaceae), A New Species from Guangxi, China. PhytoKeys. 243: 199-207. DOI: 10.3897/phytokeys.243.127579