【摘要】 <正> 在本文的第一篇报告里,我们根据自然环境下的观察和实验室内的简单培养试验的资料,得出甘紫菜的生活史具有雨个基本阶段的结论:即紫菜(叶状体)的阶段和壳斑藻(线状体)的阶段。这又使英国藻类学家德鲁关于脐形紫菜(Porpltyraumbilicalis(L.)Kütz.var.Laciniata(Lightf.)J.Ag.)果孢子萌发成为壳斑藻(Conchocelis rosea Batt.)的发现有了进一步的发展。德鲁的发现虽使紫菜生活更多还原

【Abstract】 Ⅰ. The problem relating to the origin of spores in the large-scale cultivation of porphyra, an important marine crop in the Orient, remains unsolved up to date. This is a problem of great interest to scientists and porphyra raisers as well. To the Japanese algologists in particular, this has been an outstanding problem for years. We have now obtained enough evidence to prove that the spores, which suddenly appear irt autumn in great quantity in Tsingtao and similar regions, adhere to rocks and other substrates and develop into the well-known porphyra thalli, are the conchospores from the Conchocelis-phase of Porphyra tenera. This conclusion is based on the following two facts: 1.We have discovered abundant growths of Conchocelis in the empty shells of the local oyster, Ostrea cucullata Born. This is the most common shell-bearing invertebrate on the littoral rocks in regions where abundant growths of porphyra are also found. 2.In the laboratory, we have succeeded in cultivating on shells of Meretrix meretrix L. the Conchocelis-phase of Porphyra tenera starting from carpospores and growing to maturity and spores production. As much as 1,200,000-1,500,000 conchospores are found in a single litre of the culture solution. These conchos- pores are gathered on bamboos and palm fibers and cultivated both in the labor- atory and in the sea. In four weeks, the spores have grown to 1-2 mm. porphyra thalli. Ⅱ.On the morphology of Conchocelis rosen Batt., now the Conchocelis-stage of Porphyra, algologists have divergent difference of opinions, especially in the following three phyllogenieally important characteristics: 1.On the structure of the chromatophores: we have shown that it changes with the stages of growth and development. In the carpospore stage (of Porphyra), the chromatophores are not distinctly definite the pigments appearing somewhat diffused; inthe filamentous part of Conchocelis, the chromatophores are parietal and ribbon-shaped; in the fertile cell rows, the cells when mature each cont- ains a centralstellate chromatophore with a distinct pyrenoid; in the conchospore stage, thechromatophores again become somewhat indefinite, the pigraents appearing semi-diffuse. 2.Pit-connections as suggested by Rosenvinge are very distinct, and cyto- plasmic connections between neighboring cells definitely present. 3.The position of the conchospores are not of the Erythrotrichia-type; the protoplasm of the sporangia are all involved in the formation of spores. We have observed in many of the mature sporangia, a division of the entire cell content into two spores. Ⅲ.In the first report of the series, we have summarized the life history of Porphyra tenera Kjellm. A revision must now be made since we have now shown that conchospores are not liberated when water temperature is much higher than 20℃; therefore, summer dwarf porphyra can only come from the monospores of the early summer dwarf porphyra.更多还原