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    A-D. Isoëtes xiangfei (Fern08928. A. Proximal view of megasporeꎻ B. Distal view of megasporeꎻ C. Proximal view of microsporeꎻ D. Distal
    view of microspore). E-H. I. yunguiensis (YYH15163. E. Proximal view of megasporeꎻ F. Distal view of megasporeꎻ G. Proximal view of
    microsporeꎻ H. Distal view of microspore). I -L. I. orientalis (Fern08748. I. Proximal view of megasporeꎻ J. Distal view of megasporeꎻ
    K. Proximal view of microsporeꎻ L. Distal view of microspore).
                Fig. 4  Palynological comparison between Isoëtes xiangfeiꎬ I. yunguiensis and I. orientalis



   (7) Megaspore without reticulate ornamentationꎬ chromosome numbers 44.   (8)
   (8) Rhizome 2 ̄lobedꎬ megaspore 310-410 μm (mean = 350 μm).   I. longpingii
   (8) Rhizome 3 ̄lobedꎬ megaspore 340-450 μm (mean = 409 μm).   I. sinensis

       Acknowledgments  The authors thank Prof. YU      implications for biogeography and conservation [ J]. Fern
                                                        Gazꎬ 20(8): 309-333.
   Xunlin from Central South University of Forestry &
                                                     CAVALHEIRO ̄FILHO SLꎬ GESTINARI LMꎬ KONNO TUꎬ et
   Technology for assisting in the field surveysꎬ Prof.
                                                        al.ꎬ 2021. Morphological plasticity in the endemic Isoëtes
   YANG Qiner and Prof. DENG Yunfei from South China    species from Serra dos Carajásꎬ Amazoniaꎬ Brazil [J]. Am
   Botanical Gardenꎬ Chinese Academy of Sciences for    Fern Jꎬ 111(3): 174-1954.
                                                     CHOI HKꎬ JUNG Jꎬ NA HRꎬ et al.ꎬ 2018. Molecular phylogeny
   their assisting in the correction of Latin name.
                                                        and the biogeographic origin of  East  Asian  Isoëtes
                                                        (Isoëtaceae) [J]. Korean J Plant Taxonꎬ 48(4): 249-259.
                                                     DAI XKꎬ LI Xꎬ HUANG YQꎬ et al.ꎬ 2020. The speciation and
   References:                                          adaptation of the polyploids: a case study of the Chinese
                                                        Isoetes L. diploid ̄polyploid complex [J]. BMC Evol Biolꎬ
   BRUNTON Dꎬ TROIA Aꎬ 2018. Global review of recent    20(1): 118.
     taxonomic research  into  Isoetes  ( Isoetaceae )ꎬ  with  DAI XKꎬ YANG YJꎬ LIU Xꎬ 2021. Transplanting experiment
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