Abstract
Summary The inner layer of the longitudinal walls of Oscillatoria minima is continuous with the crosswalls. Before a crosswall develops, an electron-transparent plasmatic region is recognized where the transverse wall is expected to appear. The growth of the thylakoids seems to begin just before the crosswall-formation, and continues during and after cell-division. At the margin of the developing transverse wall, a electron dense zone, sickle-shaped in cross section is always revealed. It is assumed that this zone plays an important role in the crosswall-formation such as in the production of cellwall-material. Sometimes a body with coiled membranes similar to the mesosomes of bacteria, can be observed; polyphosphate bodies, polyhedral bodies, osmiophilic granules, ribosomes, DNA-fibrils and rarely small vesicles are also recognized.
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