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Th e ultrasculpture of surface of the Chara altaica oospores by scanning electron microscopy was described from specimens collected in south of Western Siberia. Th e fossa surface is very irregularly sparsely granulated, the granules are irregular by shape, its dimensions and density are highly variable, and the small ones are prevailed. Th e wall surface between granules is smooth. Th e oospore ribs are irregularly sparsely granulated of nearly smooth.

Analysis of taxonomic structure and peculiarities of phytoplankton development in middle course of Lena River and
her tributaries - Viluy, Aldan, Amga has been presented in the paper. Wide species diversity and reach algofl ora (738
taxons) has been revealed in studied northern basins

Th e results of the study of algal fl ora saltish Lake Listvenki are presented. Th ere are 104 species, varieties of the species and forms from 6 devisions (Cyanophyta - 13, Bacillariophyta - 75, Dinophyta - 1, Euglenophyta - 4, Chlorophyta - 10, Charophyta - 1). Th e fl ora revealed is analysis ecological and geographical.

On the basis of long-term investigations the data on productivity and variability of bracken Pteridium pinetorum populations are represented in the paper. Th e forest communities and habitats optimal for bracken growing are revealed.

A revision of taxonomical structure of the section Crystallophlomis in the genus Primula on the basis of studying the herbarium collections, supervision over the plants in natural conditions and in the conditions in introduction, with using of the seed surface sculpture characters and defi nitions of nucleotide sequences of ITS-region of nuclear rDNA was carried out. Th e conspectus of species of section Crystallophlomis of the genus Primula for fl ora of Russia including 2 subsections, 4 species and 3 subspecies was made. Th e new subsection Tschuktschorum Kovt. is described, the new combination is off ered and lectotypus for 1 species was chosen.

In 15.2 % (88 species and subspecies) flower plants of subclass Lamiidae in Siberia have 4 forms of sexual differentiation: monoecy, andromonoecy, gynomonoecy and gynodioecy. The most frequent form of a sexual expression is gynodioecy (57 species, 9.8 %). From 19 families are richest with species with sexual diff erentiation Callitrichaceae, Hippuridaceae, Lamiaceae, Rubiaceae.

The ontogeny, biological characters, ontogenetic structure of coenopopulations of rare species Rhinactinidia eremophila (Bunge) Novopokr. ex Botsch. (Asteraceae) was studied in Chuyskaya depression in Kosch-Agachskii region Republic of Altai.

Relationships of crossability among biotypes E. caninus from diff erent points of the area, including morphologically deviating forms, were studied. Ninety one hybrid plants F1 in 42 cross combinations have been grown up. Data about morphological features and reproductive properties of hybrids in generations F1 and F2 are obtained. Th e estimation of inheritance of some morphological characters, important in taxonomy, was carried out. It was shown that E. caninus as the species is formed not only by typical individuals with the limited range of morphological variation, but also by the big number of the morphotypes mismatching the standard diagnosis of the species. Some deviating morphotypes are expedient to classify as varieties of E. caninus s. l.

Additions and changings in the fl ora of Novosibirskaya oblast during last 40 years are observed. New adventive
species and disappearing ones are analysed.

Th e relief of steppe belt of Iyus-Shira depression (400-600 m a.s.l.) is the alternation of plain areas, cuestas and little
ridges. Th e main vegetation of plain areas is polydominant bunchgrass steppe. Th e vegetation of little ridges and
cuestas depends on steepness and exposition of their slopes. On steep sun-exposed slopes short grass petrophytic
steppes are located. On gentle shadowed slopes the herb bunchgrass steppes predominate.