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

Large sedge beds In the most waterlogged areas of the Gödi-láprét 0.6-0.8 m high stands of Carex acutiformis and C. elata dominate the landscape. Formerly, this large sedge bed was probably purely occupied by tufted sedge tussocks {Caricetum elatae), maintained by more affluent and steady water supply in the past, but the tussocks of Carex elata more or less decayed by now. Thus, the present state of the community can be identified as a lesser pond sedge community {Caricetum acutiformis Eggler 1933); however, the presence of certain species of the rich fens, first of all funcus subnodulosus, which is really abundant in some parts of these sites, as well as Carex davalliana, Carex hostiana and Eriophorum angustifolium, give the large sedge bed the character of rich fens. The most abundant associates in this community are the common (phytosociologically more or less indifferent) marsh- and mesophilous meadow species such as Lythrum salicaria, Lysimacbia vulgaris, Calystegia sepium, Potentilla reptans, funcus articulatus, Lycopus europaeus, Mentha aquatica as well as funcus inflexus and Centaurea pannonica. Serratula tinctoria ofthe purple moorgrass meadows and Equisetum ramosissimum of the sandy grasslands are also frequent here. Some parts of the site are invaded by Calamagrostis epigeios as a result, perhaps, of a formerly dryer period in the area. Phragmites australis spreading from the direction of the ditches is also alarming, although the site has been scythed occasionally in the past. The shallower drainage ditches, recently mostly dry, are occupied by large sedge community dominated by Carex acutiformis but gradually intruded by reed, shrubby Salix cinerea and Solidago canadensis. Rich fens The most valuable communities of the study area are the blunt-flowered rush fens (Juncetum subnodulosi Koch 1926) and the black bog-rush fens (Orchio-Schoenetum nigricantis (Allorge 1921) Oberd. 1957). These have become extremely rare in the Carpathian basin as a consequence of centuries-long efforts to drain the Great Hungarian Plain by the canalisation of riverways and by digging thousands of drainage ditches. In our area of survey it is often difficult to draw a line between the beds of the two associations, since the two dominant species,/tmcti5 subnodulosus and Schoenus nigricans not only form smaller or larger patches of their own, but mostly they are mixed as codominants. Of the rich fen species Carex hostiana is abundant, Carex davalliana and Epipactis palustris are frequent, while Eriophorum angustifolium and E. latifolium are occasional. Parnassia palustris, a protected rarity of the rich fens (or according to Soó's phytosociological system (HORVÁTH et al. 1995) a common species with the purple moorgrass meadows), very abundant on certain sites in 1992, has by now almost disappeared: its population of thousands order decreased with unexpected rapidity to the order of hundreds, and later of tens. Molinia coerulea, as the most important representative of purple moorgrass meadows is almost constant, but not abundant species in the rich fen beds. Additional characteristic