With this paper we continue a new annual series, the main purpose of which is to make significant floristic findings from Russia and neighboring countries more visible in Russia and abroad. In total, this paper presents new records for 38 vascular plant species from 7 Eurasian countries, obtained during field explorations, as well as during taxonomic revisions of herbarium materials. For the first time, new locality of Rochelia bungei is recorded for Europe and West Kazakhstan Region of Kazakhstan, Arnebia obovata for China and Kazakhstan, A. olgae for China, Ballota nigra for Kazakhstan and the Asian part of Russia, Potentilla chalchorum, P. tschimganica and P. doujonneana for Kyrgyzstan, Lappula heteracantha for Tajikistan, Hedysarum talassicum for Uzbekistan, Linaria grjunerae, Silene cserei for Siberia, Dianthus × courtoisii, Genista tinctoria, Verbascum phoeniceum for Eastern Siberia, Drosera × obovata, Pseudopodospermum strictum, Trollius austrosibiricus for the Altai Republic, Diarthron linifolium for the Republic of Buryatia, Dactylorhiza iberica, Epipactis condensata for the Republic of Daghestan, Platycladus orientalis for the Kabardino- Balkarian Republic, Diphasiastrum × zeilleri for the Republic of Mordovia, Typha latifolia for the Magadan Region, Senecio viscosus for the Novosibirsk Region, Solanum physalifolium for the Omsk Region, Echinops exaltatus for the Middle Volga, Lavandula angustifolia for the Samara Region, Galium affrenum for the Saratov Region, Bidens frondosa, Elatine triandra, Eleocharis klingei, Jacobaea grandidentata, Rhinanthus songaricus and Vicia megalotropis for the Tyumen Region, Bunias cochlearioides, Thalictrum ussuriense for the Inner Mongolia Autonomous Region of China, Isoëtes echinospora for the Yamal-Nenets Autonomous Area, Potentilla × bishkekensis for Issyk-Kul and Osh Regions of Kyrgyzstan.

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The relevance of the study of fungi of the Russulaceae family is determined by the fact that they play an important role in the life of temperate forest ecosystems as mycorrhizal symbionts of the main forest-forming tree species. In addition, this group of fungi is of great practical importance, as they are edible fungi. Despite this, they are one of the little studied groups of Agaricomycetes. The information about the fungi of the studied family in the conditions of the Russian Federation is limited, and therefore the data on their ecology are contained mainly in foreign literature. The purpose of this work is to study the species composition of fungi of the Russulaceae family and to establish the influence of the main environmental factors on the distribution of this group of fungi on the territory of some forest natural monuments of regional significance (Burchikhinsky slopes, Zasursky blueberry forest, Kichkleysky pine forest with oak, Nikonovsky forest and Floodplain oak forest) in the conditions of the Penza region. The studies were carried out in 20162022 by methods of route and stationary studies. When determining fungi, the method of light microscopy was used. As a result, the species composition of fungi of the Russulaceae family of the studied natural monuments located in the Penza region was studied. Within the studied protected areas, 78 species of fungi of the Russulaceae family were identified. As a result of the taxonomic analysis of mycobiota, it was found that it included 24 species from the genus Lactarius, 3 from the genus Lactifluus, and 51 from the genus Russula. All of them belong to the ecological-trophic group of symbiotrophs. 19 species form mycorrhiza with various tree species, and 59 species have a narrow specialization in relation to partners in symbiosis (29 species are associated with Quercus robur, 15 with Betula pendula, 10 with Pinus sylvestris, 2 with Populus tremula, 1 with Tilia cordata, 1 with Alnus glutinosa and 1 with Corylus avellana). It has been established that the leading factors determining spatial distribution and productivity of fruiting bodies of fungi of the studied family are soil fertility and moisture. In megatrophic habitat conditions, acidity also has a significant effect on the distribution of fungi of the family under consideration. The species composition of fungi of the Russulaceae family for habitat types was determined in accordance with the edaphic grid. For different ecotopes, the composition of indicator species was revealed. An estimate of the yield of fruiting bodies of fungi of the Russulaceae family in various types of forests, depending on fertility and soil moisture, is given.

The nature monument of regional value Gurev ravine is located 1 km North-West village Klimovka of Shigonsky District in the Samara Region. The southern and South-Western part is occupied by the ravine, the mouth opening in the Kuibyshev reservoir. The right slope is less steep and is overgrown with deciduous forest, and the left slope is very steep and heavily nude, known as Gusikha mountain. At the mouth of the ravine as well as along the indigenous coast landslide terraces have been formed. We have described calciphyte flora and vegetation of the left slope, Guriev ravine (Gusikha mountain). We have made 5 descriptions, one (description № 14) is located at the bottom of this mountain and the other ones are at the top (descriptions № 15-18). All descriptions are made on very steep slopes (angle of 40-50) of South-Eastern exposure. The described area is dominated by subshrub vegetation with dominance of different species: Artemisia salsoloides (from 1,0 to 30,0%), Ephedra distachya (from 0 to 30,0%), Bassia prostrata (from 0 to 15,0%), Thymus dubjanskyi (from 0 to 15,0%), Onosma volgensis (from 0 to 15,0%), Anthemis trotzkiana (from 0 to 5,0%); less common Linum uralense (from 0 to 1,0%). Artemisia salsoloides (descriptions № 14, 16) occupy the lower and middle parts of the steep slopes of Gusikha mountain. They belong to two different associations. At the bottom of the slopes there are Artemisia salsoloides + Bassia prostrata + Gypsophila juzepczukii , in the middle - Artemisia salsoloides + Onosma volgensis . At the top of steep slopes there are Bassia prostrata , Ephedra distachya and Thymus dubjanskyi (descriptions № 15, 17, 18): Bassia prostrata + Artemisia salsoloides + Stipa capillata , Ephedra distachya + Artemisia salsoloides + Bassia prostrate and Thymus dubjanskyi + Anthemis trotzkiana + Gypsophila juzepczukii Association. Different types of Stipa capillata gradually implemented into the community as well as Gypsophila juzepczukii or Artemisia salsoloides , Anthemis trotzkiana , which contributes to the resumption of these particularly rare for the Samara Region species.