アサクサノリの生活史に就いて,特に秋に立込んだヒビに最初に着く胞子の性質-2-

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"Autumn Spores" of Porphyra tenera fix themselves to substrata early in autumn and give rise to winter plants. In previous paper, it was shown that in some fields in Tokyo Bay the autumn spores are not monospores. Now Kunieda (1939) reported that Porphyra tenera could be divided into severl forms, generally into two, i. e. the "long type" and the "round type". The former predominates in the localities where materials were collected in the previous work. In this report, it was studied whether it is also the case or not in other localities, especially where another type of Porphyra (the "round type") predominates. Materials were collected at Narawa (Tokyo Bay), Chita (Ise Bay) and Nameishi (AriakeSea). The results obtained were as follows. 1. Spores recognized as "autumn spores" of this alga were collected from sea water early in autumn. They measured all 10-11 μ in diameter in all samples (Fig. 1, 1-4). Monospores from autumn plants measured 14-15 μ (Fig. 1, 5-9). Carpospores in winter are known as 11 μ 2. Sporelings from the "autumn spores" were thinner than those from monospores in all samples (Fig. 2), i.e. the former should start with spores smaller than the monospores (14-15 μ). From these results it may be conceivable that the "autumn spores" are not mnonospores both in the long type and in the round type. They will be carpospores, which were formed in previous winter and have rested during summer.
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