L. Hably szerk.: Studia Botanica Hungarica 20. 1988 (Budapest, 1988)
Stollmayerné Boncz, Emilia: The alga species of the Csömör pool
when the water almost disappears - is totally covered by them. The open water is overgrown by Lemna species ( L. minor , L. trisulca ), Mentha aquatica , Myosotis palustris , Myosoton aquaticum, Polygonum amphibium f. aquaticum, Rorippa amphibia, etc. depending on the season and the quantity of water. The filamentous algae sometimes cause water-bloom to the great delight of the frogs and small crabs. Seeing the abundance of alga species in the samples taken during the water-bloom made me really be interested in the flora of the pool. Species of Vorticella , Rotatoria . Ostracoda , etc. could always be found in the samples. I had found such a great number of species in such a large quantities that it became possible for me to begin my preliminary studies in 1984-85. At the same time I had the opportunity of starting my algological research in the Botanical Department of the Hungarian Natural History Museum. CHARACTERISTIC FEATURES OF THE LOCALITIES Following the snowbreak in spring, especially if this season is rather wet, the pool is full of water. At that time even some open water can be seen. It is rather difficult to reach the island at that time (Map 2). Some open water can even be found in the localities Nos 2, 3 and 9 following warm summer weather if the precipitation in winter and spring was abundant. The pool can become so dry after a very droughty weather that the island can be approached on foot but among the sphagnum spots water can be ladled out. The year of 1984 was just the same as described above. Not all the localities were suitable for taking samples. It was almost impossible to get there because of the deep water, then because of the drainage. I chose those localities which seemed to be different from the distance, however, which could be approached easily (Map 2). In 1984 I collected monthly samples at localities Nos 1-7 from April*to December. Samples were taken only in May in 19 85, but the number of localities grew to 9. Samples were taken to obtain some information on localities Nos 1, 2, 3, 4 in April 1984. Later on some more investigation was carried out at 3 further localities and with different methods. Both in August and in September it was so dry that samples could be taken only from the water by seeping into the footprints of my boots, and even so only at two (Nos 1, 5) and one (No. 2) localities, respectively. Samples were taken at two further localities of the pool (Nos 8, 9) in May 19 85. May could be considered as the most successful month of the year in 1984 (Table 5). Localities Nos 1, 2, 3, 8 and 9 can easily by approached from the shore. Locality No. 1 is covered with bulrush and sedge, the others have areas with open water surface for a rather long time. Localities Nos 4-7 are found on the island covered with sphagnum and Lastrea thelypteris. Sample No. 6 is water squeezed from sphagnum, sample No. 4 was collected from the open water among the sphagnum. Samples Nos 5, 6 are from the water collected in a bottle sunk into an open sphagnum bolster. Samples were taken from two further localities (Nos 8, 9) during the year 1985 (Map 2). THE METHOD OF TESTING Samples were taken monthly in 3 dis fruit-jars with screw-cap. The pH of the water of the pool was determined by test paper on the spot. (The value of pH determined at localities Nos 1, 2, 3, 4, 5 was 6.0, but at localities Nos 6, 7, 8, 9 it was only 5. 5). The samples were taken by ladling, except for the one taken at locality No. 6, as it was squeezed from the sphagnum. At home the samples were stirred, then a small quantity of each was poured into small bottles of about 50 mis for the live tests to be carried out. I tested these samples at once. I cultured the alga samples by keeping the bottles on a terrace, or in winter in front of a window facing north. Both the size of the bottles and the place proved to serve well as a micro-acquarium. These micro-acquariums were also useful for testing the further phases of development at a later date.
