Экология охраняемого лишайника бриория надворника (Bryoria nadvornikiana (Gyeln.) Brodo & D. Hawksw.) в растительных сообществах Петрозаводского городского округа (Республика Карелия )

The work on studying of a condition of population of the protected lichen Bryoria nadvornikiana in spruce and aspen plant communities of Petrozavodsk was accomplished by a route method and a method of sample plots. Characteristics of plant communities, parameters of trees and microenvironment were recorded in habitats of the species. Length, width and height of attachment above the ground were also recorded for each thallus. Data on 555 thalli growing on 195 trees were analysed. It was established that in the conditions of Petrozavodsk Bryoria nadvornikiana is a widespread lichen. Most findings were made in spruce forest with Vaccinium myrtillus (46 %). The maximum number of thalli (43 %) was found on young spruce trees of age 40–54 years, 4–6 m high, with a diameter of trunk (at the height of 130 cm) 6–10 cm. The most favorable conditions for this species are formed in a lower part of crown at the height of 90–120 cm from the ground. Condition of populations of Bryoria nadvornikiana in natural plant communities of the Petrozavodsk city can be assessed as normal.