The Russian Far East covers more than 3.000.000 square kilometers and stretching from the shore and islands of Arctic Ocean on the north to Sea of Japan, Korean Peninsula and Chinese provinces of Jilin and Heilongjiang. The Russian Far East is characterized by the highest species diversity in Russia in the taxonomical view and includes 405 species of recorded hepatic species. Nine taxa of liverworts (Asterella saccata, Jungermannia konstantinovae, Leiocolea ussuriensis, Macrodiplophyllum plicatum, Mylia verrucosa, Nardia geoscyphus var. dioica, Plectocolea flagellata var. kurilensis, Porella grandiloba, Solenostoma pseudopyriflorum) were described from the treated area and ca. 20 % of liverwort species recorded here are only known from this area in Russia.
Evidently, so diverse in many respects territory requires thorough phytogeographic researches that would help to solve some taxonomic and florogenetic problems not only in the Far East, but also at least in East Siberia and extra-tropical areas fringing Pacific on the north. Solution of the latter problems is partly restrained by the lack of factual information on the distribution of the species in treated area. In the last 5-8 years the considerable progress in cognition of taxonomic diversity of hepatics and their intra-regional distribution in Russian Far East was reached. Total number of known taxa was increased for 50%, but for many provinces the number of species was increased several fold: in Commander Islands – 14 times, Kamchatka Peninsula – 3 times, Kuril Islands – 6 times, etc. The obtaining of the large amount of the new information as well as critical analysis of previously collected materials became a reason of publication of distribution dot maps. The main goal of the book is the publication of modern data on the species distribution in the Russian Far East. As far as it is obvious that the both the understanding of species diversity and the study of species distribution are endless processes, the compiling of ideal range maps is impossible. The present publication reflects the current state of our knowledge on hepatics in treated area and includes 414 dot maps for all recorded here species and for some intraspecific taxa, as well as the brief analysis of distribution patterns of hepatics within the Russian Far East. Ii is assumed that this book will benefit to preparation of the "Liverwort Flora of the Russian Far East" that planned to be published in the nearest future, and will be continued by publication of moss distribution maps for this area.
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