The article provides data about authentic materials of Betula (Betulaceae) names described from Ukraine and deposited at the National Herbarium of Ukraine (KW). For each taxon, its protologue, synonyms and text of the label are presented. We designate here lectotypes of Betula borysthenica Klokov, B. klokovii Zaverucha, and report the holotype of B. kotulae Zaverucha, and authentic materials of B. klokovii Zaverucha, B. polessica Ivchenko etc.

An annotated list of type specimens of 12 taxa of the genus Euphorbia (Euphorbiaceae) described from Ukraine and deposited in the National Herbarium of Ukraine (KW), the Herbarium of M.G. Kholodny Institute of Botany NAS of Ukraine, is given. The following data for each taxon are provided: original nomenclatural citation; type specimen(s) with category indicated according to protologues. In total 14 type specimens were found, including 7 holotypes, 2 isotypes, 2 lectotypes, 1 syntypes, 2 paratypes and 14 specimina authentica.

The article contains results of the study of the historical herbarium «Flora of Japan» (KW) of japanologist, linguist, translator, intelligence officer O.L. Kletny who was repressed as political prisoner in 1938. The herbarium materials were collected in Tokyo (Japan) in 1914 and include 88 specimens of 84 species of 51 genera of 15 families of the flora of the Japanese islands. In the paper a brief biography of O.L. Kletny is given; the methods of collections study is discussed. An annotated list of all the species contained in the three thematic herbarium albums, named «Flora of Japan. Coniferous», «Flora of Japan. (Nihon-Sinrin). Hardwood trees. I», «Flora of Japan. Bamboo (Nihon-Take)» is presented.

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