Abstract

The total number of 4760 palynomorphs distributed in 6 families of pteridophytes, 3 families of gymnosperms and 29families of angiosperms were observed and identified. About 34.2 % or 13 families of these airborne palynomorphs belong to autopatric plants, 50 % or 19 families to allopatric plants, and 15.8 % or 6 families to both autopatric and allopatric vegetation. Based on the data of seasonal variation of air borne grains the flowering periods of these palynomorphs is largely divided into fall and spring groups: Betulaceae, Compositae, Magnoliaceae and Gramineae belong in the former group, and Pinaceae, Taxodiaceae, Cupressaceae, Chenopodiaceae, Euphorbicaeae, Fagaceae, Lauraceae, Moraceae, Myrtaceae, and Cyperaceae are found to be in the latter.