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Article
Published: 2021-11-11

Adiantum japonicum, a new species of the Adiantum pedatum complex (Pteridaceae) from Japan

College of Life Sciences, Shaanxi Normal University, Xi’an 710062, China; Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650201, China
Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650201, China
Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan
Narahashi 1-363, Higashiyamato, Tokyo 207-0031, Japan
Department of Biological Science, Faculty of Advanced Science and Technology, KumamotoUniversity, Kumamoto 860-8555, Japan
Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650201, China
Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington, D.C. 20013-7012 USA
Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650201, China
chloroplast markers cytotype disjunction erect rhizome Pteridophytes

Abstract

The Adiantum pedatum complex is disjunctly distributed in North America and eastern Asia. In this study, we carried out a detailed morphological study based on 137 specimens representing the biogeographic diversity of this complex. The sequences of eight chloroplast markers of 35 samples were analyzed with maximum likelihood and Bayesian inference. The morphological and phylogenetic analyses support the recognition of a new species of the A. pedatum complex from Japan. We propose the new species as A. japonicum based on the examinations of specimens from Japan and the comparative analyses of the whole complex. This new species can be distinguished from A. pedatum by the erect rhizome and shows significant molecular differences from other species in this complex. A taxonomic description with detailed morphological characters of the new species is presented.

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