Anomalous embryo-development in Coccophora Langsdorfii (TURN.) GREV. and Sargassum tortile C. AG

Abstract

1. If the eggs of Coccophora Langsdorfii in the course of the first division after fertilization are centrifuged, different anomalous embryos develop. For example, in the lower or in the upper half of an embryo segmentation does not occur at all.
2. In a case, in which the eggs of Coccophora Langsdorfii were fertilized in a glass vessel many strongly constricted embryos appeared. In a later stage of development of these embryos rhizoids developed not only in the lower extremity, but also in the upper entremity or in the constricted portion of the embryos.
3. If the fertilized eggs of Sargassum tortile in their eight nucleate stage are centrifuged, in the first step of development, the eggs are segmented not in two, but in several cells.