フイリタサ特にその雄性體に就て

抄録

1. We can find two forms in Porphyra variegata (Kjellman) Hus on the coast of Muroran, Hokkaido; one has a eosine-pink colour and the other a red-purple or crimson. Further, the former has usually a thinner frond than the latter.
2. These differences in colour and thickness of the frond are conspicuous even in the young plant of less than 1.5cm height, but no other distinctions between these two forms can be found. Moreover, the former is usually found in earlier season than the latter, for the one is found mainly from March to May and at least not in July or August, whereas the other is found from May to August. Consequently, these two forms appear to be ecological ones.
3. When the plant is still young, the frond is divided into similar halves by a longitudinal limiting line. One half gradually becomes yellow and soon begins to disintegrate from its margin and then falls off entirely at maturity. The other half has a deeper colour and grows more rapidly at the marginal part opposite to the longitudinal limiting line, especially after disintegration of the yellowish half, and recurves unilaterally, taking a large comma-shape.
4. The former yellowish part of the frond represents an antheridial area and the latter deeper coloured is sporocarpic. Consequently, this species is apparently monoecious, although it was described as dioecious by Kjellman in his original description and he was followed by Hus, Ueda and other authors.
5. One antheridium divides into 32 or 64 antherozoids, according to the formula, 32 (a/4, b/4, c/2) or 64 (a/4, b/4, c/4?).
6. One sporocarp contains 8 or 32 carpospores after Hus and 16 carpospores after Ueda. The writer agrees with Ueda′s observation and the formula of division corresponds to 16 (a/2, b/2, c/4).