OBSERVATIONS ON THE STRUCTURE OF SOME FORMS OFGOMPHONEMA PARVULUMKÜTZ. II. THE INTERNAL ORGANIZATION1

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Abstract
SUMMARY: The diatom speciesGomphonema parvulumKütz. was isolated, grown in culture, and the details of the internal organization studied by light and electron microscopy. The organism is usually identified from its frustular morphology, but members of the genusGomphonemacan be separated from other naviculoid forms by the H‐shaped chromatophore, whose lobes are connected on 3 sides across the center of the cell, and also from the position of the pyrenoid. This is situated, on the inner side of the chromatophore and is not embedded in the center of the chromatophore. New observations of this pennate diatom include details of the periplastidial network, of the Golgi vesicular activity, and of the storage products.