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Abstract
Two morphological forms of mitochondria, vase-shaped and discoid, are described in a centric diatom, Stepkanopyxis turns (Greville) Ralfs, and their three-dimensional structure reconstructed from serial sections. The vase-shaped mitochondria, previously unreported in unicellular organisms, constitute the majority, no matter what the stage of the cell cycle. A comparison is made between the vase-shaped mitochondria and the cup-shaped mitochondria that are found in a few multicellular organisms.