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The method of scanning electronic microscopy (SEM) carries out relative research of ten representatives of subfamily Pteridoideae C. Chr. ex Crabbe, Jermy et Mickel family Pteridaceae E.D.M. Kirchn.: Jamesonia auriculata A.F. Tryon, Pteris aspericaulis Wallich ex J. Agardh, P. biaurita L., P. tenera Kaulf., P. umbrosa R. Br., Taenitis blechnoides (Willd.) Sw. As a result, morphological descriptions revealed signs that would reveal the ownership of the studied species to one subfamily - Pteridoideae .

In the work are presented studies of the ontogeny of the Sedum aizoon in the south of the Tomsk region. Morphometric parameters of the different developmental states are given. In the ontogeny of species have been allocated 4 periods and 10 age states. Propagation is by seeds.

A synopsis of 653 vascular plant species and subspecies of Mongun-Taiga mountain massif (Southwest Tuva) is compiled. The breaf taxonomical analysis of the flora is carried out.

Classification of zonal boreal forests in the Bolshoy On River basin (Western Sayan) was performed. Two associations ( Larici sibiricae-Abietetum sibiricae ass. nova hoc loco и Carici iljinii-Pinetum sibiricae ass. nova hoc loco) and two non-rank communities included in the class Vaccinio-Piceetea Br.-Bl. in Br-Bl., Siss. et Vlieger 1939 were described. The altitudinal spectrum of forest communities of the studies area is represented by two geographical boreal forests types - Urals-Siberian and Eastern Siberian. It indicates that boreal vegetation of the Bolshoy On River basin keeps transitional ecological features between ultra-humid cyclonic and moderately humid anti-cyclonic bioclimatic sectors. Importance of floristic features of boreal forests and results of syntaxonomic analysis for defi nition of bioclimatic subdivisions in the Altai-Sayanian mountain region is discussed.

Сomposition and content of phenolic compounds in the leaves of Pentaphylloides species from Russian Far East were studied. Each of Pentaphylloides species under study had its own phenolic profile: the greatest number of phenolic structure components was noted in P. mandshurica (25), the smallest one in Dasiphora gorovoii (19). Main glycosides of fl avonol types identifi ed: quercetin glycosides characterized P. fruticosa , P. davurica and D. gorovoii , glycosides rhamnetin - P. mandshurica . D. gorovoii is highlighted maximum content of phenolic compounds (total and by groups), P. davurica - by total-content of ellagic tannins. Specificity of species revealed content of quercetin, rhamnetin, quercitrin, astragalin.

Seventy three species of woody plants producing the self-sowing have been identified at the territory of Otradnoje Research Station of the Komarov Botanical Institute RAS (Priozersky district of Leningrad region). Twenty seven species may be potentially invasive - they have intruded into the natural phytocenoses. With the warming of the climate the amount of species producing the self-sowing arises and the percentage of invasive species in flora of the Karel Isthmus enlarges.

Chromosome numbers (2 n ) of 23 species from 12 families of the flora of Finland are presented. Chromosome numbers for 9 species for the first time are given.

299 species of vascular plants were revealed for the most often visited volcanoes of Kamchatka - the Avachinsky, Koryaksky, Mutnovsky. An optimum of their habitats are indicated. The history of flora investigation and characteristics of physic-geographic conditions are given. The areas as in Kamchatka and the whole Russian Far East of 88 species are shown on dotted maps. The book is richly illustrated with colour photos of plants and the landscapes.