B. Papp szerk.: Studia Botanica Hungarica 38. 2007 (Budapest, 2007)

Szollát, György, Seregélyes, Tibor, S. Csomós, Ágnes; Standovár, Tibor: The flora and vegetation of Gödi Láprét near Göd, Pest county, Hungary

the strictly protected Ophrys sphecodes and Colchicum arenarium), 23 are present in the dry and semi-dry steppes, which is even more remarkable, because these steppe fragments are small and mostly degraded. Figure 1 is the vegetation map of the surveyed area. In Table 1 the protected species are listed along with their estimated population sizes followed by the full plant record of the Gödi Láprét in the Appendix. Reed beds and reed invaded fens Permanently inundated reed beds (Phragmitetum communis Soó emend. Schmale) are found in the ponds and drainage ditches. The ditch banks are covered by narrow non-inundated reed beds, occupying the embankments formed by the soil dredged out from the canal beds. In these "terrestrial" reed beds of relatively small extension usually the most common species of marshes (or of wet habitats in general), like Eupatorium cannabinum, Lythrum salicaria, Lysimachia vulgaris, Carex acutiformis, Calystegia sepium, Humulus lupulus, Solidago canadensis, etc. associated with the reed. The overall appearance of another type of the reed beds in the surveyed area at first sight seems to be identical with the "real" ones, but the species composition differs from the reed marshes. In fact, these reed beds formerly were rich fens, which later became invaded and occupied by reed. Most of these plant communities are located on both sides of the thermal water ditch crossing the area, north of the industrial railway track. Both common and rare plant species of the fens can be found in these sites, but too often in vegetative stages and even these show a very poor growth. There are two locally abundant competitor species in terms of social behaviour (BORHIDI 1993) which are more or less resistant to the expansion stress of the reed: Molinia coerulea and Juncus subnodulosus. Common species of the rich fens (and partly the purple moorgrass meadows) include Carex flacca, Carexpanicea, Cirsium canum, Serratula tinctoria, Succisa pratensis, Potentilla erecta, Ranunculus acris, Sanguisorba officinalis, Briza media, Mentha aquatica, Selinum carvifolia, Angelica sylvestris, Tetragonolobus maritimus subsp. siliquosus, etc. Beside these some specialist (steno-ecological stress tolerant, BORHIDI 1993) and other environment-sensitive species of the rich fens also occur sporadically, such as Carex davalliana, Carex hostiana, Parnassia palustris and Schoenus nigricans as well as Valeriana dioica of the purple moorgrass meadows, while Carex elata indicates better water supply in the past. (Some parts of the earliest reed-invaded fen beds, now rather densely occupied by reed along the thermal water ditch, can already be considered as real reed beds). As shown by the species composition and the abundance of the species (SZOLLÁT 1999, 2000), this community is not a real phytosociological reed association, so the rich fen vegetation could be recovered by proper nature conservation treatment. A small patch of blunt-flowered rush fen near the northern border of the area was a good model of such treatment: it had been regularly scythed for hay for a long time, and this prevented