Abstract
In Acetabularia the chloroplasts migrate along the stalk of the cell in a circadian rhythm. Chloroplast content in the stalk was found to be high during the circadian day and low during the circadian night. Between both positions phases of massive translocation of the plastids occurred in which transverse bands of condensed chloroplasts were observed to move along the stalk. At the same time bands with acropetal as well as basipetal direction could be found. The velocity of the bands indicated the involvement of only the slow streaming system of Acetabularia into this phenomenon. Based on the properties of the movement of the bands we discuss the mechanism of the band formation and of possible characteristics of the streaming system itself.
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