Specimens of the rust fungus Uromyces erythronii were recorded on Erythronium dens-canis, a rare species listed in the Red Data Book of Ukraine, in April 2016 near Chemeryntsi village (Lviv Region, Ukraine) and in May 2016 near Zaluzhne village (Zhytomyr Region, Ukraine). An investigation of the Erythronium specimens deposited in the herbaria of vascular plants of Lviv Natural History Museum (LWS) and M.G. Kholodny Institute of Botany (KW) revealed four more samples of this fungus. A list of all localities in which U. erythronii was recorded in Ukraine is provided. The article is illustrated by micrographs obtained by scanning electron microscopy.
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