In the framework of this project, interdisciplinary research is being carried out on wild Thymus species. The study is mainly focussing on the micromorphology of the secretory pear cells responsible for the secretion of volatile oils, as well as on the microbiology and biochemistry of volatile oils, taking into account environmental factors and the stage of development of the plant. The main objectives of the project are: 1. Structure, ultrastructure, distribution and frequency of secretory pear; 2. Chemical composition and biological activity of volatile oils. Investigations are carried out using current methods and techniques of study (electron and photon microscopy, gas chromatography coupled with mass spectrometry, microplate method, Kirby-Bauer diffusimetric method). By correlating the results obtained, the study will finally provide original data on the aromatic value and therapeutic role of the investigated species, which may serve as future promoters for other complex investigations with technological transfer.