Summary: The ultrastructure of conidium formation in a wild-type, and in a temperature-sensitive and osmotic-remedial strain of has been studied. In the mutant 22 the development of true conidia was blocked at non-permissive conditions. The conidial chain elongation was basipetal in the wild-type and apical in the mutant. The result of the apical elongation was a simple or a branched chain of undifferentiated conidia, encompassed by a thin single-layered non-pigmented wall, which were limited by septa with open pores. The last, or two last, elements in the chain were potential conidia, because if the temperature was lowered they could develop into true conidia. Their wall could complete the process of thickening and appeared three-layered. The outer wall layer acquired ornaments and pigment, and the septal pore was occluded.


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