The genus Leskea in Russia is represented by one widespread species, L. polycarpa Hedw. Records of L. gracilescens appeared to be erroneous. Analysis of nuclear ITS sequence data demonstrated that North American samples of L. gracilescens and L. obscura clearly differ from European and Asian populations in several characteristic substitutions. Anomalous morphology of plants from Yakutia and Amur Province is described and illustrated. Their distribution likely corresponds to a high and late floodings of big rivers, crossing permafrost areas. РезюмеРод Leskea представлен в России одним широко распространенным видом , L. polycarpa Hedw. Указания на находки L. gracilescens в Амурской области были ошибочными. Анализ нуклеотидных последовательностей ядерного спейсера ITS показал, что североамериканские образцы L. gracilescens and L. obscura отличаются несколькими заменами от европейских и азиатских растений. Необычная морфология растений L. polycarpa из Амурской области и Якутии, вероятно, связана с сильными поздними паводками на больших реках, протекающих в зоне вечной мерзлоты.
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