Didenko S. Species of Galanthus L. (Amaryllidaceae)in nature and in culture in Ukraine.

The dissertation is devoted to research of Galanthus L. of Ukrainian flora. The complex ecological and biological investigation of the species of Galanthus in nature and culture are represented in the work. Chorological, ecological and phytocenological characteristics of three species of Galanthus of the native flora of Ukraine are given. The modern state of cenopopulation of these species is appreciated; the results of introduction of Galanthus species in Ukraine are summed up, the stage of its success in introduction are determined. The features of development of snowdrops are investigated; the comparative analysis of ontogenesis of seven species is carried out on the basis of five years researches. On the basis of these researches the recommendations for rational use of species are elaborated, the reasons of reduction of number of population are established. The system of measures of Galanthus species protection is worked out.