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

Szurdoki, Erzsébet: Peat mosses of North Hungary

Section S q liar rosa These plants are small to robust, usually medium-sized with green or yellowish colour. They have a prominent, projecting stem bud on large capitulum. Stem leaves are large and lingulate with thin border. There are two species in this section in the Northern Hemisphere with circumboreal distribution. Both have records from Hungary including North Hungary. They grow in mesotrophic to rather eutrophic habitats. Sphagnum squarrosum Crome This is a robust moss with large capitula with conspicuous stem bud and characteristic, spreading branch leaves. It has pale green colour and large ovate stem leaf. The typical plants are easy to recognise because of their robust and dishevelled appearance (DANIELS and EDDY 1985). S. squarrosum occurs in different parts of Hungary, but is relatively rare, and the habitats of several old occurrences are damaged. It lives mainly in alder and willow swamps (ORBÁN and VAJDA 1983). S. squarrosum has numerous old and new records from North Hungary, too (Table 1). Earlier it was reported from Csömöri-tó (STOLLMAYER-BONCZ 1982), from Nádas-tó (MÁTHÉ and KOVÁCS 1959), from Nyírjes-tó (BOROS 1964), from Kis-tó (DULAI and VOJTKÓ 1991), from Kis-Mohos and Nagy-Mohos (ZÓLYOMI 1931, BOROS 1964, CZENTHE 1985). Nowadays, this species is present in Nádastó, in Kis-Mohos and Nagy-Mohos from earlier reported locations and new populations were found in the Zemplén Mts, Nagy-tó, Báb-tava, Nyíres-tó, Zsid-tó and Júlia-liget. In Mohos lakes it lives not only in Salix dominated communities, but also occurs in open areas and birch dominated parts (SZURDOKI et al. in press). In the Zemplén Mts it is found along springs and streams (Tegda-völgy and Suta-patak, SZURDOKI et al. 2000) and in Nagy-tó under Salix shrubs (DULAI and VOJTKÓ 1991). In Báb-tava and Nyíres-tó it mainly lives in alder dominated parts, but in Nyíres-tó has only a small population, being a remnant of the dry period over a decade ago (NAGY 2002). S. squarrosum could have lived in the willow or alder swamps of Nyíres-tó and Báb-tava earlier, but the first data come only from the 1990s (LÁJER 1998«, b, NAGY 2002). It had a relatively large population in the Salix swamp of Bence-tó, but it (as all Sphagna) has disappeared when the basin was filled by water in 1998 (NAGY et al. 1998, NAGY 2002). It was found on floating mats of Zsid-tó in 1999 (by Szurdoki and Zoltán Tóth). There is a small patch