B. Papp szerk.: Studia Botanica Hungarica 34. 2003 (Budapest, 2003)

Szurdoki, Erzsébet: Peat mosses of North Hungary

Báb-tava in various associations (e.g. Car ici lasioearpae-Sphagnetum, Eriophoro angustifolii-Sphagnetum, Salici einereae-Sphagnetuni). It also has large populations in the Mohos lakes both in open and closed associations (SZURDOKI et al. in press). Earlier S. palustre were published also from the Komlóska and Kemence valley (Zemplén Mts), but the recent revision had proven that besides that, some S. centrale specimens were also found among those labelled as S. palustre (SZURDOKI et al. 2000). In the past few years nobody has collected S. palustre from these valleys, but it has new record from the meadow called Tó-oldal (Zemplén Mts) at the foot of Nagy-Bekecs hill (SZURDOKI et al. 2000). Although decreases and some populations have disappeared, S. palustre is still relatively frequent in North Hungary. Sphagnum centrale C. Jens. The macroscopic characteristics of this species are similar to those of S. palustre, but in the field (by magnifier) they are not easily distinguishable. The main microscopic difference is that the green cells of the branch leaf in cross section are oval shaped and strongly thickened in the adaxial walls (DANIELS and EDDY 1985). S. centrale is rare in Hungary, there are some populations in North and West Hungary. In the western part it lives in the intermediate mire of Alsó-erdő near Kőszeg (BOROS 1964, SZÖVÉNYI 1998) and from the year 1955 it has one old herbarium specimen from the Őrség region, but it has disappeared since then (ODOR et al. 2002). It is also rare in North Hungary (Table 1), occurring in bogs and fens. Earlier it has lived in Kis-tó (BOROS 1964, DULAI and VOJTKÓ 1991), Kis-Mohos and Nagy-Mohos (ZÓLYOMI 1931, BOROS 1964) and in the Zemplén Mts (SZURDOKI et al. 2000). Though in 1994 it existed there (KRÖEL-DULAY 1995), it has probably disappeared from Kis-tó, because no subsequent search could record it. Earlier, S. centrale was collected from Salix dominated parts of Mohos lakes (ZÓLYOMI 1931, CZENTHE 1985), but according to recent investigations it occurs only in the Betulo pubescentis-Sphagnetum community of Nagy-Mohos and in the Eriophoro angustifolii-Sphagnetum community of Kis-Mohos (SZURDOKI et al. in press). In the Zemplén Mts it dwells in fens of the Komlóska and Kemence valleys. Earlier collections have been identified as S. palustre (SZURDOKI et al. 2000). The populations of S. centrale appear to be stable in the Zemplén Mts, however, their size has decreased. To estimate its frequency in Mohos lakes is very difficult because of its great similarity to S. palustre in the field. It cannot be excluded