Abstract
The fine structure of zoosporogenesis in the endoparasite Olpidiopsis varians is described and compared to other oomycetous fungi. The wall of the parasite zoosporangium is composed of an inner granular to fibrous material and an outer layer of electron opaque material. Prior to cytoplasmic cleavage approximately 8–12% of the zoosporangial nuclei disintegrate. Cleavage furrows are produced throughout the parasite cytoplasm at a time when large, centrally situated vacuoles are present. The fusion of cleavage vesicles delimits the parasite zoospore initials which possess a central spherical nucleus, spherical mitochondria, dense-body vacuoles, mastigoneme packets, two kinetosomes with attached microtubular rootlets, a single kinetosome-associated organelle, and lipid bodies. The exit tube of the zoosporangium grows through the host wall and zoospores are released to the outside.
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