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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