抄録
The cytoplasmic granules of Hydrodictyon reticulatum were studied by electron microscope. Four kinds of granules were distinguished. Large dense granules (0.5-0.75μ in diameter) and small dense granules (0.1-0.25μ in diameter) were regarded as the so-called spherosomes and prespherosomes respectively. But these two types of granules are not thought to be organellae with a specific roles in the cell because no definite internal structure could be distinguished. Besides these granules, small dense particles which have similar dimensions to Palade granules and rod-shaped mitochondria which have microvilli were seen. The present results are consistent with those obtained in our previous work.
