Isoëtes changxingensis,a new species from Zhejiang Province,China,is illustrated and described here.The new species morphologically resembles I.baodongii,but it differs from the latter by 44 chromosomes,megaspore 317-411 μm(mean=360 μm)[vs.22,390-510 μm(mean=450 μm)].It is also extremely similar to I.longpingii in terms of megaspore size,with the difference that I.changxingensis rhizome corms 3-lobed,leaves 2-3 mm wide at mid-dle,megaspore echinate-cristate(vs.2-lobed,1 mm,tuberculate-cristate).This species is distinguished from I.sinensis by its smaller megaspore,different surface ornamentation,and leaf blade 20-60 cm[vs.340-450 μm(mean=409μm),cristate,15-30 cm].According to Guidlines for Using the IUCN Red List Criteria,the conservation status of I.changxingensis should be regarded as endangered(EN).
new taxonIsoëteslycophytesendangeredspore ornamentationkey to Isoëtes
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