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

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

EVALUATION OF THE RESULTS It is evident from the taxonomic list of the algae of the pool (Table 4) that here we have to do with a marshy lake rich in species, a rare situation in Hungary. Some of the elements considered rare in Hungarian conditions include Anabaena aequalis, Closterium pusillum, Nostoc paludosum (peat species), Microcystis firma, Nostoc entophytum, Tribonema reguläre, T. viride, Vaucheria sessilis, Epithemia sp. (muelleri?), Nitzschia heufleriana, Peridinium willei, Characium braunii, Cylindrocapsa geminella, Oocystidium ovale, Spirogyra sp. (dubia?), Tetraedron proteiforme and Zygnema sp. (pectinatum?). As a novelty, we can mention Oedogonium inversum f. subclusum (reference: Flora et Iconographia Algarum Hungáriáé). Therefore a more detailed description of the female fibres found in our samples (3 June, 1988 and 3 November, 1989) is given here. The vegetative cells are slightly capitated with smooth wall. Their width is between 10-12.5 ujn, their length is 35, 50, 57.5, 60 and 70 um, respectively. The oogonia with the oospores are 30,35 and 40 u,m wide and 25,27.5,30 and 40 |im long. The basic cell is 20 jxm wide at the base and the footing is 10 ujn long. In quite a number of fibres we can find only 1-1 vegetative cell between the oogonia, but in the same fibre 2-3-4 oogonia can be equally found in a series. Their colour is brown and green, some of them are split around the basis. The 'head' of the vegetative cell is slightly intruding in a convex manner into the oogonium. In 1984-85, the algal taxa of the Csömör pool were compared to those of the Nagy-tó ('Great lake') at Öcs (UHERKOVICH 1979), the Szürühely-spring in the Juniperus reserve at Bares (UHERKOVICH 1981) and the Kerek-tó ('Round lake') of Feketehegy (UHERKOVICH 1982). Similarities mentioned in the previous paper were found again during the 1987-1990 investigations as well. From an algological point of view, the consequences of the 1987 fire were severe. Higher species number and mass occurrence of certain species can be regarded, clearly, as consequences of this 'artificial fertilisation'. In case of several species, significant changes took place in the frequency of occurrence. Rare species like Meridion circulare (x-0, G2), Ophiocytium parvulum became very frequent. Frequent species turned to be very frequent: Epithemia turgida ( b, G-), Fragilaria capucina (o-b, G3), Pinnularia maior (b, G5), Rhopalodia gibba (o, G-), Cladophora glomerata (b, Gl), Oedogonium sp. Species not recorded in 1984-85, noted now as frequent are species of Tribonema. Rare species found now frequently include Lyngbya cryptovaginata, L. limnetica, Microcystis pulvera (o-b, G3), Ophyiocytium cochleare (o-b, G-), Vaucheria sessilis (x-b, G2),Amphora ovalis (o-b, Gl), Cymbella aspera (b, G4), Navicula cuspidata (b-a, G3), N. radiosa (o-b, G3), Nitzschia sigmoidea (b, G4), N. spectabilis, Chlorella vulgaris (p-a, G3). Species with decreasing frequency are Anabaena minutissima, Microchaeta tenera, Nostoc entophytum, N. paludosum, Oscillatoria planctonica, Epithemia argus, Synedra ulna. The relative frequency of the following species did not change: among the rare species, Crucigenia quadrata, Cylindrocapsa geminella, Tetraedron proteiforme, of the frequent species, Melosira italica, Stauroneis anceps and of the very frequent ones, Spirogyra longata. As many of the new species and some of the species which became more 28