B. Papp szerk.: Studia Botanica Hungarica 36. 2005 (Budapest, 2005)

Dobolyi, Konstantin: Phytosociological evaluation and multivariate analysis of the habitat of Linum dolomiticum Borbás (Linaceae) II.

- the total cover of vegetation varies between 95 and 100%, - dominant species: Anthericum ramosum, Anthyllis vulneraria, Bromus pannonicus, Carex humilis, Fraxinus ornus, Genista pilosa, Helianthemum canum, Phyteuma orbiculare, Quercus pubescens, Teucrium montanum, - Mega-mesophanerophyta, Chamaephyta and Geophyta species are of characteristic groups here (Table 9), - phytosociological composition: the proportion of the Quercetalia pubescentis-petraeae and Orno-Ostryon species is high (Table 11), - high proportion of Competitors and Generalists (Table 12), - low nitrogen preference (Table 16). Vegetation type: the herb layer is very close to Festuco pallenti-Brometum pannonici Zólyomi 1958 (Figs 1 and 2). Based on the floristical composition and the phytosociological character this group is close to the Pannonian karst white oak low woods. A number of the relevés cannot be included into any of the above groups, i.e. their pattern is diffuse in the abstract space of the variables (Fig. 2). These relevés represent transitions among the open and closed dolomite grassland communities or belong to degraded forms of those. According to the floristical composition and the principal component analysis, relevés No. 65, 138 and 139 are close to the Chrysopogono-Caricetum humilis community. DISCUSSION Results of this study have shown that Linum dolomiticum occurs in open and closed dolomite grasslands, the Pannonian karst white oak low woods and rarely in rock steppe. These vegetation types belong to the following plant communities: Festuco pallenti-Brometum pannonici, Seseli leucospermi-Brometum pannonici, Seseli leucospermi-Festucetum pallentis, Stipo eriocauli-F estucetum pallentis, Cotino-Quercetum pubescentis and in a small extent to Chrysopogono-Caricetum humilis. Some segments of the habitat are considered as being transitions among these communities. According to the multivariate analyses Stipo eriocauli-F estucetum pallentis is very close to Seseli leucospermi-Festucetum pallentis (Figs 1 and 2). In the authors' opinion it would be more correct to consider this community a subassociation of Seseli leucospermi-Festucetum pallentis, as Zólyomi has originally described it (ZÓLYOMI 1958). Distribution of Linum dolomiticum shows a special pattern: there are areas where its patches are of rather high density, and these alternate with large "empty"