Iso?tes changxingensis(Iso?taceae),a new tetraploid quillwort species from China
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
万方数据
维普
