Zs. P. Komáromy szerk.: Studia Botanica Hungarica 14. 1980 (Budapest, 1980)

Szolláth, György: Data to the flora and vegetation of the Gerecse Mountains I.

c) Parallel with the formation of closer broad-leaved forest brown forest soils are established. d) Chemozem soils; originally soils of loess-grasslands, nowdays under cultivation. Rendzina and brown forest soils are dominant on our area (Stefanovits 1963). Material and method Author took 40 coenological samples in different plant communities from spring to the end of the growing season in 1977, using 4 m

2 samples of open rock-vegetation (

Festucion rupicolae

), 16 m

2 of grassland slope steppe and loess layers (Festucion rupicolae

), and 400 m

2 of forestry plant communities. Presence of species is given by AD values based on Braun-Blanquet- Soó method (Soó-Zólyomi 1951, Soó 1965). Keeping the area's primary coenological uncovering to the fore, author was anxious to take samples in slightly degraded - seeming to be typical - stands of vegetation. Identification of plant communities was supported firstly by the summarized lists of Zólyomi (1958). Results Plant communities of the Gete group of hills (Map. 2) According to geographical subdivision (Soó 1960), the Gete - as the eastern offset of the Gerecse Mts, r belongs to the Pillsense district of the Bakonyicum floristic region of the Pannonian territory being contiguous with the Arrabonicum district of the Eupannonicum floristic region bordered with sand bed-rock on the north and east. Before taking the plant communities one after the other - since this conclusion is true nearly in every case - it is to be mentioned that those stands are very often not typical but degraded or occupy an intermediate position between two communities. This is caused - besides the previously mentioned effects of growing and forestry activities - by the small extent of stands, their frequent alternation with each other so that the angle of slope, the exposure, etc. at the same time soil- as well as mezo- and microclimatic conditions change from one extreme to the other within short distances. Querco petraeae - Carpinetum pannonicum (Zólyomi 1958, Soó 1964) (On the basis of 4 samples. The data of the samples see later ) The most extensive forests are to be found on the north-eastern part of the Nagy-Gete. The tree layer of the closing plant community of hombeam-oak forest (Q.-Cp. pann. ) - positioned solely extrazonally in the examined region - is represented by Quercus petraea (1 - 4) and Carpinus betulus (1 - 4). Fraxinus ornus (1 - 3) is present in every stand; this is the most frequent (in some places dominant over the others) species in the shrub layer of this community. Considering the herb layer (failing samples taken, based on the flora list) it can be stated that both the corydaletosum (Zólyomi 1958) and the melicetosum (Zólyomi I.e.) subassociation are surely present. The dominance of Corydalis cava and the mass of other geophytons illustrate the spring aspect of corydaletosum while Melica uniflora (+-1 - 4-5) is dominant in the other, also extended subassociation. Caricetosum pilosae (Zólyomi I.e.) subassociation Is rarely present here. This mark can be found in brackets after the names of species. Subassociations of an association differ qualitative from each other, distinguishing species of the subassociation are the separating or differential species (Soó 1965).