The first record in Ukraine of Arrhenia chlorocyanea (Hygrophoraceae) is reported. The species is rather rare, or mostly overlooked, in Europe. A complete description of the fruit bodies and details of their microscopic structure is provided. In addition, information on the habitats and worldwide distribution of the species is presented. The article is illustrated with original photos and drawings of the fungus.

Keywords: Agaricales, Europe, mosses, rare species, Ukraine

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