The checklist of mosses of the southern part of the Russian Far East includes 816 species and 10 infraspecific taxa with references on their distribution in seven floristic regions within Primorsky and Khabarovsky Territories, Amurskaya and Sakhlinskaya Provinces and Evreiskaya Autonomous District. Seventy one species are excluded in the course of the checklist compilation, and 59 are commented as doubtful and erroneously reported from some of the Far Eastern regions, while 8 of them doubtful for the southern part of Russian Far East in general.

The paper presents a checklist of the species invading the natural phytocenoses of the Far Eastern Federal District of Russia (FEFD) that includes 40.6 % of the state territory. It summarizes original data on distribution, habitats and inva sive ness status (IS) of 116 alien species belonging to 99 genera of 32 families. Eigh teen species are only beginning to invade natural cenoses and have IS 3; 76 species intensively invade natural cenoses and are listed in the group with IS 2. Trans former are represented by 22 species with IS 1, of which Ambrosia arte misiifolia, Bidens frondosa, Solidago canadensis, Impatiens glandulifera and Hordeum juba tum are most widely distributed. A very strong heterogeneity of the soil and cli mate conditions accounts for a considerable disparity in the list of alien species between various territorial districts of the FEFD. Many species that actively co lo nize southern districts do not occur in the north, or only individual plants of them are reported. The article is a step towards the preparation of the Black Book of the Russian Far East flora and the basis for making decision on prevention the economic and environmental damage of the natural biodiversity of the region.

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 vi sible in Russia and abroad. In total, this paper presents new records for 24 vascular plant species from 4 Eurasian countries, obtained during field explorations, as well as during taxonomic revisions of herbarium materials. For the first time, new locali ty of Ageratum conyzoides, Salvia hispanica, Thymus rasitatus, Tulipa mongolica is recorded for Russia, Sparganium glomeratum for North Korea, Alyssum armenum for Georgia, Thymus pseudopannonicus for Kazakhstan, Cymbalaria muralis for the Asian part of Russia, Anthemis ruthenica for Siberia, Capsella orientalis, Echinops sphaerocephalus, Hera cleum sosnowskyi, Thymus elegans for Eastern Siberia, Persicaria orientalis for Western Si beria, Galatella crinitoides for the Black Soil Region, Centaurea orientalis for Zavolzhye, Silene dichotoma for the Altai Republic, Onobrychis arenaria, Symphyotrichum squamatum, Verbesina encelioides for the Republic of Dagestan, Geranium dahuricum for the Re public of Sakha (Yakutia), Koeleria spryginii for the Republic of Tatarstan, Phacelia tanacetifolia for Sakhalin, Adonis wolgensis for Novosibirsk Region. For each species, the general distribution, habitat, and taxonomy, indicating differences from related species and location are presented.

The problem of protection and conservation of rare and endangered plant species in the wild is currently the topic of discussion and research worldwide. The Orchidaceae plants are of special concern. Orchids are so well adapted to their environments. Moreover, they have special requirements that makes it difficult to transplant them from the wild and they are rarely surviving after. They are therefore a key group in conservation. This research aimed to study the polymorphism of Cypripedium guttatum flowers in their natural populations on selected locations in Russia. On the basis of studying C. guttatum populations in Primorsky Krai, Sverdlovsk region, Komi Republic, and Krasnoyarsky Krai, we identified and described five forms of C. guttatum in terms of their flower colouration. A comparison study of the infraspecific structure revealed that the form variation in the studied C. guttatum populations was the highest in Primorsky Krai and the lowest in Sverdlovsk region. A discriminant analysis indicated the following statistically significant morphometric parameters to recognise different forms of C. guttatum: shoot height, leaf width, flower width, height and width of dorsal sepal and staminode width. A population variation analysis was conducted with respect to the following three indicators: the average number of morphs per population, the rare morph ratio in the population, and the similarity index of the studied populations. On the basis of monitoring C. guttatum populations and studying their infraspecific structure, as well as the biology and ecology of this threatened orchid species, we developed a specific conservation project for rare and endangered orchid species complying with the unique biology of these plants.

Two new liverwort species, Gymnomitrion kamchaticum sp. nov. and Marsupella aleutica sp. nov., are described based on integrative taxonomical approach derived from mor phology, phytogeography and sequence data. Gymnomitrion kamchaticum is morphologically most similar to Gymnomitrion brevissimum, G. mucronulatum and G. pacifi cum, but differs from them by leaf insertion, shape of leaves and leaf cells. Marsupel la aleutica is morphologically somewhat similar to the Holarctic M. emarginata s.l., M. funckii, M. sprucei, M. ustulata and the East Asian M. minutissima and M. pseudofunckii, but differs in leaf shape and occasional presence of a tooth at antical leaf base.

The liverwort taxa with ciliate leaves occurring in the Russian Far East are reviewed. In total, 9 taxa belonging to four families (Jubulaceae, Ptilidiaceae, Neotrichocolea ceae and Trichocoleaceae) are recorded, 6 species occur in Russia in the Far East on ly.Theidentificationkeys,morphologicaldescriptionsandfiguresbasedonma te rials from the Russian Far East are provided.

Porpidia hydrophila-new to the Russian Far East; Alyxoria culmigena, Caloplaca stillicidiorum, Cladonia borealis, C. gracilis ssp. turbinata, C. stygia, Lecidella carpathica, Rhizocarpon expallescens and R. super fi ciale-new for Southern part of the Russian Far East; 19 species are reported for the first time for Sakhalin, six-for Iturup Island, and one-for Kunashir Island. For each species, the general distribution, habitat, and taxonomy, indicating diffe ren ces from related species and location are presented. 14 species were excluded from the lichen list of Sakhalin Region predominanty from Kunashir Island. All spe ci mens of Pseudocyphellaria crocata published from the Russian Far East were re identified as P. perpetua.

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