Vol 109, No 8 (2024)

For the first time, a complete annotated list of vascular plant species is provided and the local flora (LF) “Burulginsky Cape” is analyzed. It is the richest known LF in the lower reaches of the Indigirka River (262 species and subspecies, 109 genera, 41 families), including a number of the species rare in the northern Yakutia and seven species listed in the regional Red Book, as well as taxa endemic to the Arctic ×Trisetokoeleria jurtzevii Probat. and ×T. taimyrica Tzvel. The similarity of the studied flora with LFs from the East Siberian and Chukotka provinces of the Arctic floristic region (lower reaches of the Anabar, Lena, Indigirka, Kolyma Rivers, and Western Chukotka) is discussed; its type is determined as the East Siberian hypoarctic flora, with a predominance of mesophytes in its composition and with a noticeable participation of the species of arid habitats. The territory of the Burulginsky Cape LF with an area of about 200 km² is recommended to include in the category of specially protected objects as an area of increased diversity of vascular plants.

This article provides information about the ultrastructure of intercellular communications in Chaetopteris plumosa. The structure and variants of plasmodesmata localization in its cells are described, data on the distances between plasmodesmata and the density of their location in cell walls are provided. In C. plumosa, both independent plasmodesmata and cell wall areas with multiple closely spaced plasmodesmata were found. Such localization of intercellular connections may represent a transitional variant between independent plasmodesmata and pit fields or another variant of plasmodesmata organization previously not described in brown algae. The arrangement of plasmodesmata in Sphacelariaceae is discussed.

The plasmodesmata in C. plumosa have a structure typical of brown algae. In the longitudinal walls of the medulla, there are independent plasmodesmata, the distance between which on sections is (268 ± 147) nm (mean ± SD, n = 255). In the longitudinal and transverse walls of corticating rhizoids, plasmodesmata are often located much more densely and evenly, the distance between them is (90 ± 29) nm (n = 2863), and there are 39 ± 4 (n = 54) plasmodesmata per 1 μm². It is advisable to classify this variant of localization of plasmodesmata as pit fields or transitional variant between independent plasmodesmata and pit fields.

The information is given on 8 species of vascular plants new for the flora of Sakhalin Island: Arthraxon langsdorffii (Trin.) Hochst., Carex neurocarpa Maxim., Clematis serratifolia Rehder, Digitaria ischaemum (Schreb.) H.L. Muehl., Dracocephalum charkeviczii Prob., Eriochloa villosa (Thunb.) Kunth, Geranium maximowiczii Regel et Maack., and Sisyrinchium septentrionale E.P. Bicknell. The localities of the newly found species are indicated, brief data on their geographical distribution and growing conditions are presented.

For the purpose of the Atlas of the Russian Flora production, we converted data from floristic checklists published in 636 sources from 1975 to 2023 into e-form. We gave preference to complete floristic checklists, however for some areas with low data density partial lists, route records, vegetation relevés and reviews, and in some cases, scattered publications with floristic records also served as data sources. As of April 4, 2024, the Local Floras of Russia dataset (doi: 10.15468/rxtjt2) contains 682,130 plant records from 3,297 geographic locations. The geographic coordinates and georeferencing accuracy are indicated for all species within each floristic list. The average georeferencing accuracy is 28 km. Open access to the database is provided through the GBIF, which allows users to download it either as a whole or in parts, in tabular form. New sources are continuously incorporated into the database.

The article is devoted to the 90th anniversary of the outstanding Russian botanist, professor, doctor of biological sciences Boris Nikolaevich Golovkin. The main milestones of his biography, an overview of scientific and science-popularizing activities are presented. The article is based on the analysis of published works of the scientist, personal memories and archival materials.