Abstract
Young embryos of Coccophora Langsdorfii just differentiating the primary rhizoids were ultracentrifuged at 25, 000 times gravity for five minutes. As a result, the following was discovered.(1) The cell of normal young rhizoid contains plastids, the nucleus, pale globules and the cytoplasm matrix. The plastids are localized in the distal region, the nucleus in the middle, and the pale globules in the proximal region. When the rhizoid is centrifuged laterally, each of these elements is stratified centripetally in each zone. This indicates that their specific gravities are smaller than that of the hyaline matrix of cytoplasm.(2) If the rhizoid is centrifuged in the proximal or in the distal direction, the pale globules are also stratified to the centripetal end, while the plastids and the nucleus are gathered to the centrifugal being separated from the pale globules by a transparent zone intervening.(3) The pale globules are considered to be a kind of physodes, having properties reducing ferric ions and Fehling's solution.
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