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                 Guihaia  Oct. 2022ꎬ 42(10): 1623-1631

   DOI: 10.11931/ guihaia.gxzw202112045
   舒江平ꎬ 顾钰峰ꎬ 欧治国ꎬ 等. 中国水韭属两个四倍体新种 [J]. 广西植物ꎬ 2022ꎬ 42(10): 1623-1631.
   SHU JPꎬ GU YFꎬ OU ZGꎬ et al. Two new tetraploid quillwort speciesꎬ Isoëtes longpingii and I. xiangfei from China (Isoëtaceae)
   [J]. Guihaiaꎬ 2022ꎬ 42(10): 1623-1631.



     Two new tetraploid quillwort speciesꎬ Isoëtes longpingii


                  and I. xiangfei from China (Isoëtaceae)


                   1ꎬ 2            1ꎬ 3             4              5               6             6
   SHU Jiangping     ꎬ GU Yufeng      ꎬ OU Zhiguo ꎬ SHAO Wen ꎬ YANG Juan ꎬ LU Qiyong ꎬ
                               7                3                   2∗                  1∗
            ZHANG Xianchun ꎬ LIU Baodong ꎬ WANG Ruijiang ꎬ YAN Yuehong

   ( 1. Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilizationꎬ the Orchid Conservation & Research
    Center of Shenzhenꎬ Shenzhen 518114ꎬ Guangdongꎬ Chinaꎻ 2. Key Laboratory of Plant Resources Conservation and Sustainable Utilizationꎬ South
     China Botanical Gardenꎬ Chinese Academy of Sciencesꎬ Guangzhou 510650ꎬ Chinaꎻ 3. Life Science and Technology Collegeꎬ Harbin Normal
     Universityꎬ Key Laboratory of Plant Biology in Colleges of Heilongjiang Provinceꎬ Harbin 150025ꎬ Chinaꎻ 4. Hunan Shangjie Instrument Co.ꎬ
      Ltd.ꎬ Changsha 410000ꎬ Chinaꎻ 5. Shanghai Chenshan Botanical Gardenꎬ Shanghai Chenshan Plant Research Centerꎬ Chinese Academy of
       Sciencesꎬ Shanghai 201602ꎬ Chinaꎻ 6. Tongdao Dong Autonomous County Forestry Bureauꎬ Huaihua 418500ꎬ Hunanꎬ Chinaꎻ 7. State
         Key Laboratory of Systematic and Evolution Botanyꎬ Institute of Botanyꎬ Chinese Academy of Sciencesꎬ Beijing 100093ꎬ China )


       Abstract: Two new tetraploid quillwort speciesꎬ Isoëtes longpingii and I. xiangfeiꎬ from China are described and
       illustrated. I. longpingii is a fully submerged plant found in a small pond of Hunan Province. It is morphologically similar
       to I. sinensisꎬ but differs in its small and tuberculate ̄cristate megaspores and soft slender leaves that grow up to 60 cm. It
       is also similar to hexaploid I. orientalisꎬ but differs in its 44 chromosomes and tuberculate ̄cristate megaspores. I. xiangfei
       is most similar to diploid I. yunguiensis in megaspore ornamentationꎬ but differs in its microspore ornamentationꎬ oblong
       sporangiumꎬ and 44 number of chromosomes. There are a few individuals of I. longpingii found in Ningxiang City of
       Hunan Provinceꎬ and I. xiangfei is distributed in the wetlands of Tongdao and Huitong counties of Hunan
       Province. Because of their limited geographic rangesꎬ small populationsꎬ fewer individuals and disturbed habitatsꎬ
       I. longpingii and I. xiangfei are evaluated as critically endangered (CR) and vulnerable (VU) categoryꎬ respectivelyꎬ
       according to the IUCN Red List criteria. A key to all the current known Chinese quillworts is also provided for further
       taxonomic identification and conservation of these rare and endangered plants in China.
       Key words: new taxonꎬ Isoëtesꎬ Lycopodsꎬ polyploidꎬ heterosporousꎬ aquatic plants
       CLC number: Q949    Document code: A    Article ID: 1000 ̄3142(2022)10 ̄1623 ̄09




    收稿日期: 2022-01-13
    基金项目: 中国科学院战略先导项目(XDA19050404)ꎻ 国家自然科学基金面上项目(3217020964)ꎻ 哈尔滨师范大学研究生创新项目
    (HSDBSCX2021 ̄01)ꎻ 兰科植物保护与利用国家林业和草原局重点实验室开放基金项目(OC202103) [Supported by Strategic Priority
    Research Program of the Chinese Academy of Sciences (XDA19050404)ꎻ National Natural Science Foundation of China (3217020964)ꎻ Harbin
    Normal University Postgraduate Innovation Project ( HSDBSCX2021 ̄01)ꎻ Open Fund of Key Laboratory of National Forestry and Grassland
    Administration of Orchid Conservation and Utilization (OC202103)]ꎮ
    第一作者: 舒江平(1991-)ꎬ博士ꎬ主要研究方向为蕨类植物系统基因组学ꎬ(E ̄mail)sjp1991@ 163.comꎮ
   ∗
    通信作者: 严岳鸿ꎬ博士ꎬ研究员ꎬ研究方向为蕨类植物多样性与进化ꎬ(E ̄mail)yhyan@ sibs.ac.cnꎻ 王瑞江ꎬ博士ꎬ研究员ꎬ研究方向为植
    物分子系统与进化ꎬ(E ̄mail)wangrj@ scbg.ac.cnꎮ
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