Abstract
The paper summarizes the accumulated data on the distribution and status of coenopopulations of 5 lichen species listed in the Red Data Book of the Rostov Region: Cetraria steppae, Cladonia foliacea, C. magyarica, Xanthoparmelia pulla, Thalloidima sedifolium. Thalloidima physaroides detected for the first time for the territory of the Rostov Region. In the region under study, 32 new localities of Cetraria steppae, 20 of Cladonia foliacea, 20 of C. magyarica, 15 of Xanthoparmelia pulla, 7 of Thalloidima sedifolium, and 11 of Th. physaroides were identified. The limiting factors for the listed species are both natural factors (low competitive ability, narrow ecological amplitude, low density, and number of coenopopulations) and anthropogenic factors.
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