SUMMARY: The structure of mitochondria and of vacuoles in and has been studied by electron microscopy of serial thin sections and subsequent model building. The models of the two cells of which were studied confirmed our earlier findings, made by high voltage electron microscopy of thick sections, that there is a single, branched and continuous mitochondrial network in the cell (Davison & Garland, 1975). A model of a cell showed that the mitochondrial structure was far more continuous than expected from inspection of thin sections, there being but two large and two small mitochondria. The models demonstrated that the few large vacuoles in were interconnected into a single cluster, whereas in there were two separate complexes of interconnected vacuoles towards each pole of the cell.


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