Results of the Mycological Investigation of the Shoot System of “Irinovsky Oak” Tree (Leningrad Oblast, Russia)

The wild nature monument “184-year-old oak tree in the village of Irinovka” (Leningrad oblast, Russia), better known in local historical literature as “Irinovsky Oak,” was officially opened in 2013. It is represented by a separate pedunculate oak tree (Quercus robur), planted in 1829 and preserved in satisfactory condition at 194 years of age. This paper presents data from a survey of the shoot system of the tree investigated. A total of 12 fungal species were registered (Cladosporium herbarum, Colpoma quercinum, Coryneum depressum, Diatrypella quercina, Erysiphe alphitoides, Hyphoderma setigerum, Laetiporus sulphureus, Mar-chandiomyces corallinus, Peniophora quercina, Trichoderma viride, Sphaerulina quercicola, Vuilleminia comedens). The lichenicolous species Marchandiomyces corallinus was reported as a new find to the Leningrad oblast. It was shown that the shoot system of the tree investigated is associated with a complex of Quercus robur-adapted and coadapted species, among which such necrotrophs as Sphaerulina quercicola and Coryneum depressum and such pathogenic saprotrophs as Vuilleminia comedens and Colpoma quercinum, as well as saprotrophs (Diatrypella quercina, Peniophora quercina), dominated. This species complex ensures a continuous process of the crown’s thinning.