L. Hably szerk.: Studia Botanica Hungarica 23. 1992 (Budapest, 1992)

Stollmayerné Boncz, Emilia: The alga species of the Csömör pool II.

RESULTS Taxonomic evaluation It is apparent from the species list (Table 4) that the number of taxa identified is 111. This is an obvious increase compared to the years 1984-85, when 65 species were identified. The new species are marked on the list with an asterisk. Among the 20 Cyanophyta species, there are seven new ones, but six rare species have been 'lost'. The pattern of most species is similar to those of 1984-85. The eight Euglenophytae can be considered as new, as none of them were found during the previous analysis. In the previous study, only occasional occurrences of Euglena and Phacus were recorded. By now, species number and frequency of occurrence have increased, thus their publication (with certain reservation) became necessary. Among the eight species of Xanthophyceae, four species were formerly unknown from the pool. The species Ophyocytium arbuscula as well as three species of Tribonema are among them. These latter taxa can occur quite frequently in sampling points 1 and 3. No explanation for this was found. Reproductive specimens of Vaucheria terrestris, mentioned in the preceding study, were not found. The reproductive forms of Vaucheria specimens were assigned with certainty to the species V. sessilis. Thus the fibres found this time, the fibres germinating from the oospore (calabash and bottle gourd) and the oogonium were also assigned, with a question mark, to V. sessilis. Thus this species is counted among the new records as well. Among the 29 Bacillariophyceae, there were four items which were connected to the fibrous algae with gelatinous stalk. Including these forms, nine species are new to the flora of the pool and only one of the species was 'lost'. The two Pyrrophyta species are regarded as new elements, not observed in the 1984-85 material. As the species Peridinium willei was found in masses in May 1988,1 paid close attention to sample 3 of 1984 again, where in the April collection, 1-2 specimens were found. Among the 44 Chlorophyta species, there are 30 new ones and eight species 'lost' compared to the previous material. This considerable increase in species number can be attributed, partly, to the Oedogonium species appearing in great numbers and variable fibre width. On the basis of reproductive forms three species were identified: Oedogonium sp. (Oe. pisanum?), Oe. sp. (Oe. pringsheimii?) and a new one, namely Oe. inversumf. subclusum. The other members of the taxon were separated only after the width and character of the fibre. Several (4) new species of Characium were found as well. Generally speaking, the number of the euphyton species is increasing. They can form thick incrustation on some Cladophora and Vaucheria fibres and floating Lemna species. The bulk of these forms was not identified. Many of them were small Bacillariophyceae and thin fibreous algae. Five new Closterium species were found, some of them occurring in great masses. The Zygnema sp., found in the material of 1984-85, was probably Z. pectinatum. All the species 'lost' were among the rare species. Thus I am convinced their