L. Lőkös szerk.: Studia Botanica Hungarica 27-28. 1996-97 (Budapest, 1978)

Szerdahelyi, Tibor, Penksza, Károly, Dobolyi, Konstantin Z., Szollát, György, Kapocsi, Judit; Figeczky, Gábor: Vegetation and point-mapping survey in the strictly protected areas of the landscape protection area of the Pilis Mts (Hungary)

rection; here even Lithospermum purpureo-coeruleum and on the northwest facing steep slope of the ridge Luzula albida are also present. In the herb layer of the narrow oak stand on the ridge near the road, south to the Carex pilosa-type Querco petraeae-Carpinetum stripe, partly because its closeness Carex pilosa dominates; Melica uniflora, Poa nemoralis and Festuca heterophylla are also present with large cover. In the western end of this oak forest stripe, on the slope of the ridge with western exposure Luzula albida-type Quercetum petraeae-cerris can be found on acidic soil. The border and the southern slope of the hilltop in the eastern corner is the Corno-Quercetum pubescentipetraeae fragment mentioned several times. On the southern side of this hilltop and on the range running to west very dry oak forest is present (Poa nemoralis, Dactylis polygama, Festuca heterophylla, Melica uniflora), and a Pinus nigra forest replacing the former association. The soil is acidic as the bedrock is also sandstone mixed with limestone. The most remarkable botanical values are Corno-Quercetum pubescentipetraeae stands on the steep south, southwest slopes and the shrub forest stand or the variant of both evolved on acidic bedrock and soil. The herb layer has lower cover rates than in the other cases on limestone, slower regeneration, shallower and detrital soil, this is why the treading of moufflon and red deer can cause increased damage. Valuable (protected) species are: Adonis vernalis, Aster amellus, Vicia sparsiflora, Stipa pulcherrima. On the gently inclined area at the bottom of the steep slope a Quercetum petraeae-cerris stand is found. Large part of this stand is transitional, Fraxinus ornus and Carpinus betulus trees of the same height are present together in some places and their cover rate can reach 15-15%. The transitional character of these particular stands is enhanced by the composition of the herb layer of the Melica uniflora-iype Querco petraeae-Carpinetum stand near the eastern border of the range. Beside Melica uniflora the quantity of Oryzopsis virescens and Lithospermum purpureo-coeruleum is also considerable. The characteristics of Quercetum petraeae-cerris are also the large rate of Quereus cerris (40-60%) in some places, the dense shrub layer (in many places cut), the considerable quantity of Oryzopsis virescens and Lithospermum purpureo-coeruleum beside the dominance of Melica uniflora in the herb layer. As a result of the shrub cuttings and forest thinning the quantity of Poa nemoralis and Dactylis polygama is large. Both grasses, but especially Poa nemoralis, played an important role in other disturbed sessile oak-turkey oak stands, too (FEKETE et al. 1987, 1994, CSONTOS 1994, 1996). Ranges 1, 3 and 4: Beside the Corno-Quercetum pubescenti-petraeae stands the shrub forests, the slope steppe and rocky grasslands of these three ranges are the most valuable nature conservational values. (The conservation of the gene pool of any nudum-type beech forest has naturally the same importance as