I. N. Mikhailova and E. L. Vorobeichik
Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences, ul. Vos’mogo Marta 202, Ekaterinburg,
620144 Russia
Received April 22, 1998
Abstract—Atmospheric pollution (SO2 and heavy metals) causes consistent changes in the dimensional and
age structure of local Hypogymnia physodes populations growing on fir trunks. The age states were distin-
guished according to the quality of soralia and the degree of their development. Upon an increase in pollution,
the frequency distributions of thallus weight and length shift toward smaller individuals, although their type
remains relatively stable (exponential for weight, lognormal for length). Upon transition from the background
to the impact zone, the spectrum of age states shifts from highly fertile to minimally fertile and sterile indi-
viduals.
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