Artificial Parthenogenesis in Sargassum piluliferum C. AG. (Preliminary note)

Abstract

In Sargassum piluliferum C. AG., the liberated eggs were developed when they had been treated doubly at first with butylic acid sea water and then with CaCl₂ hypertonic sea water, resulting in the rhizoid formation. While, it was not so when they had been treated with the other reagents or with none. that this development is the parthenogenesis and accordingly that the appearance of the polarity is not affected by sperm entrance. It is also possible that the calcium ion needs not only to accenturate the tonicity of the sea water, but also to make the developmental process easy.