B. Papp szerk.: Studia Botanica Hungarica 30-31. 1999-2000 (Budapest, 2000)
Szurdoki, Erzsébet, Tóth, Zoltán; Pelles, Gábor: The Sphagnum populations of the Zemplén Mts, NE Hungary
vised, and our study (mainly based on the difference in cross-section of branch leaves) has proven that some S. centrale specimens were found among those labelled as S. palustre. These two species have similar morphological characters, and the subtle differences can only be observed through study in microscope. The shape of stem leaves and the cross-section of branch leaves distinguishes the two species. In cross-section, the green cells of 5. palustre are triangular or of trapezoid shape and are closed among the hyaline cells only on the abaxial side of the leaves and exposed widely on the adaxial side. Green cells of S. centrale are of oval shape, and are strongly thickened at the adaxial walls (DANIELS and EDDY 1985). S. palustre is relatively the most wide-spread species of the genus in Hungary, and its occurrence can be expected on the fens. It should be noted, that identification of peatmosses (e.g. WARNSTORF 1911) in the time of Boros and Vajda was indeed difficult and S. centrale was treated as the subspecies of S. palustre in many references (which is true even nowadays). Sphagnum occurrences of Kemence Valley Near Kőkapu, Sphagna can be found in a fen (see 1 on Fig. 1 and Table 1 ), as it was published by VAJDA(1969), BOROS (1964, 1968) and also SlMON(1977/b). They recognised the presence of S. palustre (the authors' revision has resulted in the recognition of S. palustre and S. centrale among the collected material) and S. contortum. Today a well visible takeover of the area by alder stands is observed in the fen, shading and suppressing the peatmosses. Thus, S. centrale and S. contortum can only live in larger patches in the open parts of the habitat with sufficient light. The other bryophyte species of the habitat are: Lophocolea heterophylla, Calliergonella cuspidata, Climacium dendroides, Plagiomnium affine, Plagiomnium undulatum, Pleurozium schreberi and Polytrichum formosum. Tabic 3. Sphagnum occurrences on moist roadsides and on the water-flooded places and in forests. The table shows the old and new Sphagnum occurrences by species; the old ones, reported earlier and have been revised, while the new ones are results of recent studies. Moist roadsides and on the water-flooded places Forests Sphagnum species 12 13 14 15 16 17 18 19 Sphagnum species old new old new old new old new old new old new old new old new S. capillifolium + S.fallax + + + S. flexuosum + S. palustre + + S. quin quefar mm + +
