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)

The southern part of the Querco petraeae-Carpinetum, bordering the oak forest stripe from north and growing on acidic soil, is disturbed, intersected by roads and ditches and similarly the stand is on acidic soil and the herb layer is rather scattered. In the western part Carpinus betulus trees were thinned, but it can be found as new growth and nibbled saplings abundantly in the herb layer of the planted oak forest. As a result of plantation dominant species of the herb layer are Poa nemoralis, Dactylis polygama and Rubus species. (The southwest corner of range 7, i.e. the shelving part of the plateau of the hill Fekete-hegy can be considered as a transitional habitat between Querco petraeae-Carpinetum and Quercetum petraeae-cerris associations owing to the above mentioned reasons). The Melica uniflora-type Quercetum petraeae-cerris stand near the range 6 also contains a smaller rocky projection with shallow soil and dry climate. A transitional stand towards the Corno-Quercetum pubescenti-petraeae association can be found here, as indicated by the occurrence of Fraxinus ornus, Cornus mas, Cynanchum vincetoxicum and Lithospermum

purpureo-coeruleum in it. The small Melica uniflora-type. Quercetum petraeae-cerris stand can be found on the edge and the upper part of a southern steep slope. In spite of its small area many oak forest species are present in its herb layer: Silene nutans, Serratula tinctoria, Festuca heterophylla, Achillea distans, Iris graminea, Teucrium chamaedrys, Lathyrus niger, Lithospermum purpureo-coeruleum, and even steppe and shrub forest species: Inula ensifolia, Anthericum ramosum, Betonica officinalis. In the tree layer Quereus cerris x pubescens and Fraxinus ornus occur as well. Towards southeast of the oak forest patch at lower elevation on a steep slope with shallow soil a zone of Seslerio hungaricae-Fagetum extends. Not far from the 25/1 border stone hornbeams could not reach their normal height therefore forming a second tree layer in some places. The majority of the old Quereus cerris individuals are frost-injured which indicates the boundary location and the transitional character of the stand. In the southern part of this Querco petraeae-Carpinetum stand, on the southwest slope and top of the ridge (see contour map) a Corno-Quercetum pubescenti-petraeae-\ik& stand fragment is found on rocky, shallow soil with many shrubs (Cornus mas, Crataegus monogyna) and the oak forest species indicating a drier and warmer habitat: Sedum. maximum, Teucrium chamaedrys, Brachypodium pinnatum, Cynanchum vincetoxicum, Lithospermum purpureo-coeruleum. The same description refers to the little, therefore not marked spot in the southeast corner of Melica uniflora-type- Querco petraeae-Carpinetum stand that is near the glade between ranges 6 and 7, where Festuca sulcata and Anthericum ramosum are also present. Range 9: The oak patch stretching into the Carex pilosa-type Querco petraeae-Carpinetum stand is situated on the western side of a ridge of northwest di-