A record of Botrychium lanceolatum (S. G. Gmel.) Ångstr., a new species for the flora of the middle zone of European Russia from Kostroma Region

The article reports on a find of a new plant native to the flora of central European Russia – Botrychium lanceolatum (S. G. Gmel.) Ångstr., which was discovered during a survey of a 60-year-old clearcut in the course of floristic work on the territory of M. G. Sinitsyn “Kologrivskiy Les” State Nature Reserve (the Kostroma Region). Collection and determination were carried out by the author of the article I. G. Krinitsyn. For the Kostroma Region, the species was not indicated in any floristic checklist. Herbarium specimens of the aboveground part of the sporophyte are kept in the Herbarium of the Kostroma State University and the “Kologrivskiy Les” State Nature Reserve Herbarium, as well as transferred to the Herbarium of the Altai State University (ALTB). B. lanceolatum is a relict species of the forest zone of the Holarctic with a fragmented range mainly in the subarctic, northern temperate zone and in the mountains of the warm temperate zone of Eurasia and North America. In Russia, it is sporadically found in the forest zone from the Murmansk and Leningrad Regions to Kamchatka and Sakhalin, inclusively; it enters the Arctic on the Chukchi Peninsula. The species is rare throughout its range; the populations are represented by single individuals. It is included in many regional Red Data Books of the Russian Federation. B. lanceolatum became the fifth species of the Botrychiaceae Nakai family in the pteridoflora of the Kostroma Region (and the middle zone of European Russia as a whole). In the Kostroma Region, the species is located on the extreme southern border of the range in the middle zone of the European part of Russia. The population of B. lanceolatum at the time of the discovery was represented by 4 individuals in different ontogenetic states. The data on the new location and phytocenotic conditions of growth of the species are given; a brief morphological description and information on the dynamics of the population are presented.