1. Regarding the taxonomical position of
Schizomeris Leibleinii KÜTZ, a difinite theory has not been given yet. This depends upon the obscurity of its life-history. Now as we could get a suitable matetial, its life-history has been observed.
2. In the so-called filament, macro- and microzoospores are produced. The writer could not, however, observe the latter one with details. A macrozoospore is wide elliptical (19μ×13μ) or globular, and has an eye spot, four cilia, irregular deep green chromatophores, and many granules.
3. The macrozoospre suddenly rests just after the escape from the filament until the germination starts and after germination it stops its growth at the length of 100μ-300μ with in 5 to 7 days after germination.
4. Upon the filament which came from a macrozoospore, one or two bright green, watermelon-seed-like gametes, 11μ×7μ and with two cilia, an eye spot, a pyrenoid and sparsely small granules, arise from one cell.
5. A zygote is produced in the result of conjugation of such gametes. The zygote has a thick wall and 13.5μ long in diameter. The resting period is so short that the zygote has germinated within a month.
6. A body which germinated from the zygote, grows so prosperous that it developes into a filament with a length of 40μ within a day, and can be recognized even by naked eyes.
7. Though there are no cytological demonstration in this case, the life-history of this species can be supposed as follow:-
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