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Article
Published: 2022-07-19

Reinstatement of Loxogramme yigongensis (Polypodiaceae), an endemic species from southeastern Xizang, China

School of Ecology and Environmental Science, Yunnan University, Kunming, 650091 Yunnan, China
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, Sichuan 610041, China
CAS Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China.
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, Sichuan 610041, China
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences (CAS), Kunming 650201, Yunnan, China
Loxogramme lamina texture Medog phylogeny Pteridophytes

Abstract

Loxogramme yigongensis, so far known only from the type specimens collected in 1965 and treated as a synonym of L. grammitoides, is reinstated. Morphologically, these two species are closely related but L. yigongensis differs in having succulent lamina, becoming rugose when dry, lamina lanceolate with acute apex, widest near middle of lamina, and costa not or slightly raised on lower surface. Molecular analyses based on five plastid loci resolved these two species as sister to each other with distinct divergence. In addition, the ploidy level of the two species are reported for the first time.

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