Fitocenološki opis bukovih gozdov v dolini Raše (jugozahodna Slovenija)

The paper discusses and supplements the knowledge of the phytosociological composition of Fagus sylvaticaforests in the Raša Valley, on the northeastern edge of the Karst, or more specifically, in the area between the plateau of Vrhe, the Senožeče lowland and the Karst. They are classified into two associations, Seslerio autumnalis-Fagetumand Hacquetio-Fagetum. A new subassociation (-lamietosum orvalae) and a new geographical subvariant (subvar. geogr. Helleborus istriacus) were determined for the association Hacquetio-Fagetum. Although they occupy small areas these beech forests are an important part of the predominantly oak and hop hornbeam forest vegetation of the Karst, constituting a Natura 2000 habitat type Illyrian Fagus sylvaticaforests (Aremonio-Fagion). They are threatened by climate change and excessive logging.