A structure of fungal flora was studied in aggregates of various diameter in a chernozemic rendzina and a lessive soil. Aggregate diameter influenced strongly the distribution of fungi such asCephalosporium, Fusarium, Penicillium and sterile mycelia. The percentage of the above fungi changed with changing aggregate diameter as follows:Cephalosporium: 1–3>5–7 >0.5 in lessive soil and ≤0.5>5–7>1–3 in chernozemic rendzina,Fusarium: ≤0.5>1–3>5–7 in lessive soil and 5–7>1–3>0.5 in chernozemic rendzina,Penicillium: 5–7>0.5>1–3 in lessive soil and 1–3>0.5>5–7 in chernozemic rendzina. The effect of aggregate size on the generic composition of fungal flora in the outer and inner parts of the aggregates was weaker than on that in the whole aggregates. This held especially forCephalosporium, Fusarium and sterile mycelia in the outer part of aggregates andPenicillum in the inner one. Moreover, the percentage of some fungi in whole aggregates of both soils was affected byV a/V w in the aggregates. Additional effect in lessive soil aggregates was that of the percentage of pores measuring 0.1–0.05 μm. Some pores affected the contents of some fungi in the outer part of the aggregates of both soils and in the inner one of chernozemic rendzina aggregates.