Zoospore ultrastructure of three Chytridium species and Rhizoclosmatium globosum

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Abstract
Zoospore cytology of C. lagenaria Schenk, C. confervae (Wille) Minden, C. olla Braun and R. globosum H.E. Petersen is described. Zoospores of C. confervae, C. olla and R. globosum have many ultrastructural characteristics in common and, of particular significance, show similarities in the basal area by the kinetosome; here 2 sets of 3 electron-dense, stacked, plate-like bodies are on the side of the kinetosome opposite to a parallel, non-functional centriole. Zoospores of C. lagenaria instead of having plate-like bodies have an electron-dense, half-saddle-shape structure partially convering the kinetosome. The position of certain organelles in C. lagenaria further distinguishes it from the other 3 spp. Zoospores of all 4 spp. have a membrane-bound cluster of ribosomes, usually a single lipid body with a rumposome and microbody in association with it, a bundle of microtubules which connect the rumposome and kinetosome and, in the peripheral area, striated (paracrystalline) inclusion. Comparison with other chytrids is made and taxonomic implications are discussed.