Abstract
In the years 1969-1970 the parasitie mycoflora of plants occurring in the littoral of 51 lakes of the Olsztyn and Mrągowo lake distriets and inthe Land of Great Lakes was examined. 132 species of parasitic fungi on the 150 vascular plants species were found, 6 of them for the first time in Poland, and 9 on hosts hitherto not observed in Poland. The influence of ecological factors such as the zone of the littoral, the position and irradiation of the coast etc. on the occurrence of pathogens was noted. The effect of some pathogenes on the transpiration, level of nitrogen and phosphorus, calorific value and yield of host plants wasalso examined, maily for Phragmites communis Trin.
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