The formation of zoospores in the aquatic Phycomycete, , has been studied with the electron microscope. Flagellum formation, zoospore-membrane formation and nuclear-cap formation comprise the sequence of major events that occur within a zoosporangium upon the addition of water to a culture of the organism growing on an agar surface. At least two distinct kinds of cleavage vesicles were found: those that delimit the zoospore and those that delimit the flagellum and nuclear cap. The vesicles that form the zoospore membrane originate from the sporangium membrane while vesicles that form the primary flagellar vesicle and nuclear cap may originate from cisternae of the endoplasmic reticulum.


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