Two new diploid species of Isoetes (Isoetaceae: Lycopodiopsida) from Southeastern China based on morphological and molecular evidence Author Liu, Chenlai 0000-0002-9637-022X State Key Laboratory of Hybrid Rice, Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China chenlailiu@whu.edu.cn Author Yu, Xiaolei 0000-0002-4806-9432 State Key Laboratory of Hybrid Rice, Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China yuxiaolei127@163.com Author Song, Xiaoli 0000-0002-9980-1435 State Key Laboratory of Hybrid Rice, Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China 18854891083@163.com Author Shao, Jingjing 0000-0002-2806-5063 State Key Laboratory of Hybrid Rice, Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China 2019202040007@whu.edu.cn Author Chen, Yuchu 0000-0003-0933-2354 Hangzhou Tianjing Aquatic Botanical Garden, Hangzhou 310000, P. R. China cyc1933@126.com Author Liu, Xing 0000-0001-8343-2551 State Key Laboratory of Hybrid Rice, Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China xingliu@whu.edu.cn text Phytotaxa 2024 2024-03-26 642 1 37 49 http://dx.doi.org/10.11646/phytotaxa.642.1.3 journal article 302309 10.11646/phytotaxa.642.1.3 6a78a54a-7458-48e1-82bb-1185c2be86f3 1179-3163 13214145

TABLE 1. Comparative accounts on the morphology of megaspores and microspores of Isoetes species in China.

	I. changleensis	I. yuhangensis	I. baodongii	I. sinensis	I. longpingii	I. xiangfei	I. orientalis	I. taiwanensis	I. yunguiensis	I. hypsophila	I. shangrilaensis
Note:/ represents no data.
Megaspore diameter (μm)	246–314	270–324	390–510	317–424	310–410	390–450	350–460	280–340	340–430	361–510	207–273
Mean megaspore size (μm)	284	302	450	378	350	430	420	312	390	450	245
Ornamentation of megaspores
proximal surface	tuberculate	rugulate	echinate-cristate	echinate	tuberculate-cristate	cristate-reticulate	cristate-reticulate	tuberculate	cristate-reticulate	levigate	levigate
Equatorial surface (girdle)	rugulate	smooth	/	loss	/	/	/	smooth	loss	loss	smooth
distal surface	rugulate	rugulate	echinate-cristate	echinate-cristate	tuberculate-cristate	cristate-reticulate	cristate-reticulate	tuberculate-cristate	cristate-reticulate	levigate	tuberculate-rugulate
Range microspore size (μm)	14–20	16–26	22–27	20–29	27–30	26–28	20–38	20–28	20–25	19–25	11–24
Mean microspore size (μm)	18	21	25	25	29	27	34	24	22	22	19
Ornamentation of microspores	blunt-tipped echinate	sharp-tipped echinate	echinate	echinate	echinate	echinate	echinate-tuberculate	echinate	levigate-granulate	rugulate	echinate-cristate
Chromosome number	22	22	22	44	44	44	66	22	22	22	22
Data Source	this study	this study	Lu et al. 2021	Liu et al. 2008	Shu et al. 2022	Shu et al. 2022	Liu et al. 2008	Liu et al. 2008	Liu et al. 2008	Li et al. 2019	Li et al. 2019 Shu et al. 2022