Palynological analysis of deposits ranging from the Middle Oligocene through the Upper Miocene from borings in the Great Poland Lowlands is presented. Mais climatic-floristic phases on the territory under study have been characterized on the basis of the results of palynologic.ai analyses. A permanent tendency has been found to eliminate succesive warmlike components of flora in younger warm phases of the Neogene. Descriptions of 174 species of sporomolfph are given. A new genus, Iteapollis a new species Microfoveolatisporis minutus and several new combinations have been erected by the present writer.