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

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

circumstances it was filled with tap water. These samples were marked 'Td' (from dry parts of Typha latifolia). 2. under the water level, another 5 cm piece was cut from the same plant and put into dry glass again. Subsequently they were also filled with tap water and marked 'Ta' (from subaquatic part of Typha latifolia). The sample taken from sampling point 6 in 1987 is an immersed one, but differs from the rest in that the water in the hollows was filled with moisture filled with plant debris (Amblystegium, Typha and Carex fragments) like a cabbage soup. The sample is marked 'h' (from hollows). At the same place, during the dry summer of 1988, sample was taken from trodden footprint, marked 't\ The above marks are used consequently in Tables 1 and 4. For the indoors examination 50 ml of the shaken (homogenized) samples were separated for 'in vivo' analysis. They were freshly examined and stored subsequently in well-lit space facing north void of freezing. These 'micro-aquaria' were equally suitable for the analysis of different stages of evolution in later times as well. The bulk of the samples was preserved in formalin on the day of sampling. EVALUATION OF THE SAMPLES For the assignation of the species, the following manuals were used: BARTA et al. 1976, FELFÖLDY 1981, HORTOBÁGYI 1968, HUBER-PESTALOZZI 1950. KADLUBOWSKA 1984, KRAMMER et al. 1986, 1988, MROSINSKY 1985, NÉMETH 1988, RIETH 1980, PASCHER 1930, UHERKOVICH 1966, WOLLE 1887. A normal light microscope was used for identification of the species. Only part of the species were identified, with special regard to Cyanophyta, Euglenophyta, Xanthophycaea, Bacillariophyceae, Pyrrophyta and Chlorophyta taxa. Cyanophyta and Chlorophyta taxa with very thin and very small textural elements (3-4 |xm) were equally omitted, just as the very small Bacillariophyceae which are very abundant in the lake. In the accounts of the results, the expression 'rare' was used when the species was found in less than 5 samples; 'frequent' is used for presence exceeding 5 but not more than 10 samples; 'very frequent' was used for presence in more than 10 samples. The expression 'epiphytic' was used only for algae located on floating water plants (mosses with fibres, Lemna sp., Ricciocarpus natans).