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Electron microscopy of conidiospore formation in Aspergillus niger.

Conidiospore formation in Aspergillus niger which occurs at the distal end (growing point) of each secondary sterigma is initiated both by the protrusion of the cytoplasm and the thickening of the cell wall. The outermost wall layer ruptures at the growing point and through this aperture the cytoplasm rapidly protrudes. The cytoplasmic process then develops into a cup-like structure with a narrow neck formed by an inward thickening of the inner wall layer of the parent sterigma. At this stage, the cytoplasm of the developing conidium contains a single nucleus, some mitochondria and other cytoplasmic organelles. The conidium is finally isolated from the cytoplasm of the parent sterigma by a completion of the inward extension of the inner cell wall. During conidial formation, there is no evidence that the cells of the sterigmata are multi-nucleate. The vesicle from which sterigmata arise becomes vaculoated in the process.