L. Hably szerk.: Studia Botanica Hungarica 20. 1988 (Budapest, 1988)

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

PATTERN ig. 1 Monthly distribution number of the alga species found in the Csömör pool The different localities produced the alge species in a different quantities. Locality No. 9 had practically no alga species at all. There were only few species found at Nos 8 and 6, none of them new for the area except for Crucigenia quadrata at No. 6. Localities Nos 1 and 3 - which seemed to have the most species even from a great distance - proved to have the greatest number of alga species. There was a high number of species in the samples taken at localities Nos 4, 5 and 7 as well. It is worth-while to study the different species according to the localities. First let us survey them in a summary according to the groups and taxa (Table 1). There was a large number of species both in the pool and on the island. Some species occurred only in the pool, especially at locality No. 1. All the Xanthophyceae were found only in the pool. Eight species - which are not characteristic for sphagnum - could be collected only from the island. Turbary scecies were found in the pool, too. The fact that this pool is of a small size and it has a >pe running from south to north, can explain the assumption that there is an overflow. H rice there is no great difference in the vegetation so that it could form special localities : the algae. Rather, the difference can be noted between the open water and the areas covd with bulrush, reed and sedge. Studying the data of the species found in 1984-85 (Table 4), it can be stated that local! No. 1 comes first because of the 50 species found there. (Eleven species were identified only from here and 4 of them are considered to be rare species: A

nabaena aequalis, Ophiocytiur

ri cochleare

, O. parvulum, Navicula cuspidata

, Characiurn eremosphaerae

. Eudorina i • ;noisensis

, Granulocystis verrucosa

, Oocystidium sp.

, Ped

iastrum boryanum, Spirogyra i, .

ignis, Tetraedron proteiforme

). Twelve species are from two localities, 4 of them being rare. The next richest site is locality No. 2, where 26 species were found. Twenty-four species were identified from locality No. 5 (one of these is rare known onfrom here: Eunotia monodon var. mai or)

. Locality No. 4 comes next with 23 species found only there. Three of them could be found only at this locality (

Hapalosiphon h

ibernicus

, Characiurn hookeri, Zygnema s p.

, two are considered to be rare) and other three species were collected from two localities (one of them rare). Sixteen species were found at locality No. 7 (one of these species was collected only from this locality: Nitzschia spectabilis

). There was only one species at locality No. 6 (the sample was taken by squeezing) and this species occurred nowhere else (

Crucigenia quadrata

). Neither locality No. 3 nor No. 8 had any species specific to these localities. DISCUSSION A taxonomic survey of the enumerated alga species (Table 4) clearly shows that the ömör pool has a large number of species and many of them are considered rare in Hungáry. The rare species found in the pool (based on own data) are the following: Anabaena - ^qualis

, Hapalosiphon hibernicus, Nostoc paludosum, Spirogyra insignis (turbary species), i

crochaete tenera, Microcystis firma

, Nostoc entophytum, Plectonema gracillimum, Eu-