One of the reasons for the weakened state of English oak Quercus robur L. in coppice oak forests of the southern forest-steppe of European Russia is trunk and butt rots, the causative agents of which are the representatives of pathogenic polypore fungi (PPF). This article is devoted to the study of the state of oak stands due to the prevalence of PPF on the oak. The research was carried out in the south-western part of the Central Russian Upland in the seasons of 2009−2017. The research objects were coppice oak stands in upland and ravine oak forests with English oak Q. robur L. and the PPF species associated with oak. The communities include the following species: Fistulina hepatica, Laetiporus sulphureus, Fomitiporia robusta, Inocutis dryophila, Pseudoinonotus dryadeus, Daedalea quercina, Hapalopilus croceus, Grifola frondosa, Fomes fomentarius, Polyporus squamosus. Field surveys were carried out according to a complex methodology using the methods of traditional phytopathology and modern mycocenology and the adapted methods of mycopathocenological surveys. The methodology of cameral research consisted of general scientific methods of systematization of primary empirical data using the methods of descriptive statistics, correlation and regression analysis and estimation of the difference of sample means. As a result of the studies, a significant positive correlation was revealed between the value of the weighted average category of the state of viability of oak stands (СV1-6) and the value of the total prevalence of species from the PPF communities on the oak (R): r = 0.388 (Student’s t-test tactual = 2.562; the critical value of Student’s t-test tst = 2.021; the number of degrees of freedom k = 37; the probability of incorrect estimation P = 0.05). Statistical models reflecting the interdependencies between these values were obtained: СV1-6(R): Y = = 0.0268X + 2.2290; R(СV1-6): Y = 5.6262X – 5.7204. These models allow estimating changes of each of the specified values by changing the other.

This study aims to describe the population of the field blewit (blue stalk mushroom) Lepista personata (Fr.) Cooke (= L. saeva (Fr.) P.D. Orton) on the territory of the botanical Garden of the Belgorod University as a model object for studying the territorial populations of the same and other species similar in bioecology. Eating it as long as the mushroom is cooked well should not cause any kind of illness. But if consumed raw, it may cause stomach upset, pain or diarrhea in the consumer. The main health advantage of the blewit is nutritional, however, it is considered by some to hold medicinal potential. It is traditionally utilized to prevent symptoms of thiamine deficiency(beriberi) and also in wound care. This work aimed to describe the population, medicinal potential, and chemical properties of Lepista personata (Fr.) Cooke (Tricholomataceae) on the grounds of the botanical garden of Belgorod University as a model facility for the study of territorial populations of the same and other, similar in bioecology, species. The object of research was the population education L. personata on the territory of the botanical garden of Belgorod University (NIU "BelSU"). The work used methods of mycofloristics and mycocenology. The population of L. personata was studied during the fungus's fruit-bearing period during the seasons 2012–2019. Intrapopulation structures were detected and outlined based on observations of fruit body clusters, configuration of clusters and their allocation. As a result of the research carried out on the territory of the botanical garden, 9 loci of L. personata have been identified and described. Of these, 2 loci represent elementary L. personata mycocells, 2 loci represent isolated mycocells, 4 loci represent an interconnected grouping of mycocells contacting at the propagule (propagu lum) level; a complex L. personata mycocell represents 1 locus.