This paper deals with vegetation in series of sample plots put in the aim to define ecological-vegetational units within forest management unit 'Dubicka gora' and to make basis and scope of future forest management. Research encompassed montane beech forest of Iliyian region (Fagetum montanum illyricum, Fuk. et Stef., 1958) and its more mesic type, forest of beech and Acer obtusatum (Aceri obtusati-Fagetum, Fuk. et Stef., 1963). On the basis of floristic composition and site conditions in the community Fagetum montanum illyricum, four subcommunities were set apart: typicum, aceretosum, drymetosum and geranietosum.