SEASONAL CHANGES IN THE SIZE OF PHYCO- AND PHOTOBIONT CELLS IN SOME LICHEN SPECIES OF THE KNYSZYŃSKA FOREST (N-E POLAND)

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  The effect of season on the size of phyco- and photobiont cells in the thalli of 12 lichen species from Knyszyńska Forest were investigated. Measurement of these cells showed three size groups: young cells, fully grown vegetative cells and autosporangia. The season with the highest percentage of young cells was considered to be the most favourable time for phyco- and photobiont cells propagation. The highest percentage of young cells of phyco- and photobiont was found in the thalli of lichens collected in: winter in Ramalina fraxinea; winter and spring in Parmelia sulcata and Peltigera canina; spring in Cladonia furcata; spring and autumn in Cetraria islandica and Hypogymnia physodes; summer in Platismatia glauca and Pseudevernia furfuracea; autumn in Cladina arbuscula, Peltigera rufuscens and Xanthoria parietina; and autumn and winter in Evernia prunastri.