Phytodiversity of Eastern Europe

94–104

Authors: Efremov A.N., Lapirov A.G.

Stratiotes aloides L. is a common species in European Russia. It plays an important role in the functioning of fresh, mesoeutrophic, low-flowing water bodies with silty-clay and organic bottom deposits. It was found that in European Russia S. aloides forms at least 24 associations related to 12 formations of freshwater macrophytic vegetation. At least 119 species take part in the formation of these associations. Phytocoenoses of associations Stratiotes aloides purum, Stratiotes aloides aquiherbosa, Stratiotes aloides + Lemna trisulca and Typha angustifolia – Stratiotes aloides are the most common.

116–124

Authors: Efimov P.G., Legchenko M.V.

The article is devoted to the description of Platanthera chorisiana, an intriguing East Asiatic and North American Orchid, which was surprisingly discovered in an isolated locality in Moscow Region, although the possibility exists that the specimen might be mislabelled. This finding is discussed in the light of the presence of some other localities of this tax-on, proved to be positioned outwards from its main distribution area, although not so distantly spaced. We provide analogies with other Orchids, especially with the recent sensational find of East Asiatic representative of genus Liparis in West Europe. In short, we discuss also some other peculiarities of Platanthera chorisiana, which put this species apart from other representatives of its genus.

137–145

Authors: Kazakova M.V., Baranova O.G., Ivanova A.V.

As a result of expedition work in 2019 on the flora of the Oka river basin within the Nizhny Novgorod Region, a number of rare vascular plant species were identified. Their findings complement the information on the flora of this region. The article provides of locations and habitats for 36 native and 2 alien vascular plant species. Besides, additions to the flora of the biostation of the Nizhny Novgorod University are given.

150–157

Authors: Pismarkina E.V., Khitun O.V., Morozova L.M., Bystrushkin A.G., Byalt V.V., Shcherbakov A.V.

The 9 aquatic vascular plants species were found in the Yamalo-Nenets Autonomous Area (Callitriche cophocarpa Sendtner, Potamogeton berchtoldii Fieb., P. gramineus L. s. l., P. obtusifolius Mert. et Koch, P. sibiricus A. Benn., Lemna turionifera Landolt, Sparganium natans L., Sagittaria natans Pall., Ranunculus circinatus Sibth.). Field studies were carried out in 2012–2017. For each species are given: data from the herbarium label, information on distribution in the Yamalo-Nenets Autonomous Area, brief comments on distribution in Western Siberia and neighboring regions of European Russia.

166–178

Authors: Dunaev A.V., Dunaeva E.N.

The article presents the results of studying the state of the regional population of Hemileccinum impolitum (Fr.) Šutara (=Boletus impolitus Fr.) on the territory of Belgorod Region of the Russian Federation. 3 habitats of this species have been identified in the region. It has been established that the threatening factors for H. impolitum in Belgorod Region are: the low frequency of occurrence of habitats with local populations, the point of local populations, the dis-tances between the nearest populations, the disturbance (destruction) of habitats on cause of recreational load and the collection of fruit bodies. The following set of measures to maintain this species in nature is recommended: preserva-tion of existing habitats and search for new ones in characteristic ecotopes; taking identified habitats under territorial protection; monitoring the number of known habitats at least once every 2−3 years; environmental education of the population.