The article reports distribution data on a rare fungus Chlorophyllum agaricoides (Agaricales, Basidiomycota) in Ukraine. This species has secotioid fruiting bodies as a result of adaptation of agaricoid fungi to arid environmental conditions. Chlorophyllum agaricoides is on the Red Lists of fungi in several European countries. In Ukraine, it is known from the following regions: Central (Right Bank) Polissya; Right Bank and Kharkiv Forest-Steppe; Donetsk, Right Bank, Left Bank, and Starobilsk Grass-Meadow Steppe; Right Bank and Left Bank Grass Steppe. New records from Dnipropetrovsk, Donetsk, Kherson, Mykolaiv, and Poltava regions were provided mainly by members of the Facebook group Fungi of Ukraine and added to the list of previously known localities of the fungus. Despite the increased number of finds, C. agaricoides remains a very rare species in Ukraine. Therefore, this species is proposed to be included in the Red Data Book of Ukraine and the need of searching for its new localities is emphasized.

Keywords: Agaricaceae, Endoptychum agaricoides, new records, rare species, Red Data Book of Ukraine, secotioid fungi

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