In the field the carpospores liberation from the cystocarp in Gracilaria verrucosa seems to occur chiefly when the tide is rising as reported by Suto (1950) in Gloiopeltis. The details of such liberation were investigated in the laboratory. The materials were collected in Hakata Bay in their maturating season: June to July. After half-dried for 2-92 hours, the materials were immersed in sea water for observation. After 0-10 minutes, some of their cystocarps begin to liberate carpospores one by one. About 200-2000 carpospores are liberated once from each cystocarp, taking about 10-50 minutes. In the early stage the spores are liberated in a large number, and the number gets thinner towards the later stage. The spores liberated in the middle and later stages are slightly smaller than in the early stage. The broken spores were observed in a considerable number in culture of the spores liberated in the later stage. As to the germination, the spores which remain in the cystocarp after liberation and also in the one with out the occurrence of liberation, were examined after they were pushed and then picked out of the cystocarp. The obtained result was that the larger number of such seemingly immature spores were also able to germinate as in the liberated spores in culture.
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