Abstract. in this paper the problem of non-parametric estimation of the probability density function for hydrological data is considered. For a given random sample X 1 , X 2 , ..., X n we define an estimator fˆn of the density function ƒ based on a function K of a real variable -the so-called kernel of a distribution -and a properly chosen number sequence {h n } from the interval (0, ∞). this estimator of density function of a random variable X under more general assumptions is known in the statistical literature as the Parzen-rosenblatt estimator or the kernel estimator. The method of kernel estimation presented in the paper has been applied to determine the probability distribution of the groundwater level based on long-term measurements made in the melioration research carried out at the foothill object Długopole.
The paper contains a list of 312 species of fungi which are parasites of vascular plants in areas which are now in the Piła and Bydgoszcz voivodships. They were collected by the author (who died in 1973) in the years 1968-1973. <i>Tilletia holci</i> and <i>Puccinia littoralis</i> were reported for the first time in Poland and several species were observed on host previously not noted in Poland.
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