Clathrus archeri (Phallales, Basidiomycota) was considered a rare fungus in Ukraine. Therefore, it was included in the Red Data Book of Ukraine (3rd edition, 2009) as an endangered species with a disjunctive range. However, the authors collected new information on its distribution to demonstrate that the species is a common fungus in four regions of Ukraine, namely Chernivtsi, Ivano-Frankivsk, Lviv, and Transcarpathian regions. Clathrus archeri occurs in disturbed plant communities which remain under the influence of human activities (cutting down trees, roads, grazing, etc.) and contain large amounts of organic matter, such as wood shavings, sawdust, branches, leaves, dry grass, and dead wood. In the above regions, every year a number of the fungus localities increases and penetration of this fungus into anthropogenic plant communities such as gardens, kitchen gardens, young plantations of common oak and red oak is observed. Undoubtedly, C. archeri is an invasive alien species. Moreover, the fungus aggressively invades natural and anthropogenically altered plant communities of the Carpathians and nearby territories. Consequently, it is concluded that the species is erroneously listed in the Red Data Book of Ukraine. Further distribution of the fungus can pose a threat to native plant communities of the Carpathians and adjacent regions. It is emphasized that any reproduction of this species in vitro following by its introduction into the ecosystems of Ukraine is unacceptable. Such intrusion into the mycobiota of Ukraine can become dangerous and lead to unexpectedely harmful and uncontrollable effects. Clathrus archeri should be excluded from the Red Data Book of Ukraine as an alien and invasive species.
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