The article considers the ecological structure of the Dothideomycetes and the peculiarities of its formation in conditions of steppe ecosystems of the steppe zone of Ukraine. The materials of the work were the original mycological collecting carried out within the mycological survey of this territory during 2008-2020, sporadic collections of 2021 and 2023, as well as the materials of the herbarium of the M. G. Kholodny Institute of Botany (KW). Herbarium collection and identification of the samples were performed in accordance with the generally accepted methods of cameral processing of xylotrophic, herbotrophic and coprothrophic micromycetes. As a result of our research, characteristic features of the ecological structure of the investigated mycobiota were established, in particular, the dominance of saprotrophic (103) and herbotrophic species (74). Phytotrophic species of micromycetes develops on 120 species of vascular plants, with the largest number of micromycetes (65 species) noted on plants of the Asteraceae. The most significant ecological and biological peculiarities of the investigated mycobiota in the conditions of steppe communities of the steppe zone of Ukraine are the formation of stable consortium relationships with a considerable variety of higher plants, zonal and seasonal change of the habitats as a adaptive mechanism for the settlement of the studied species of fungi. The prospect of further research is the study of changes in the species structure of micromycetes under the conditions of anthropogenic influence in the steppe ecosystems of the steppe zone of Ukraine
Dothideomycetes, ecological structure, steppe communities, steppe zone of Ukraine
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