Based on one year's collection (from May 1, 1977 to April 30, 1978), the aerial fungal spora of Taipei had been figured. A total of 4,960 isolates distributed among 73 genera were recorded. Of which, the majority (79.24%) were species of Cladosporium (28.13%), Yeasts (27.08%), Aspergillus .S2% Penicillium (6.88%), Curvularia (4.15%), Alternaria (2.96%) and Fusarium (2.52%). These genera occurred every month. A further eighteen genera were also isolated consistently but less abundantly, especially species of Actinomyces, Phomay Botrytis, Aureobasidium, Gloeosporium, Trich-oderma, Pestalotia, Monilia and Papularia. The remaining forty-nine genera occurred very infrequently. More colonies were recorded during the winter months than the hot summer months, with many genera showing a distinct seasonal periodicity in frequency of isolation. There were close correlations between temperature, rainfall and the number of colonies recorded. The results showed numerous similarities with those of comparable investigations elsewhere, providing further evidence for the existence of a relatively uniform structure of the fungal atmospheric population.