Abstract
Undaria pinnatifida (Harv.) Sur. is an endemic species in this country. It has two different forms, namely, f. distans Miyabe et Okam. and f. narutensis Yendo. Generally speaking, the former represents the northern type and the latter the southern. The distribution of this alga is in a wide range, extending from almost southern end of Kyûsyû to Muroran on the pacific coast and Risiri Island on the western coast of Hokkaidô, and as far north as Busuitau about 20 miles south to the River Tomankô along the eastern coast of Tyôsen (Corea). It does not grow in subtropical waters nor in subarctic ones, so it is not found in the districts washed by the warm current “Kurosiwo”, as well as by the Kurile Current. Since the above mentioned range of the distribution suggests an idea that a full or short crop of this alga may be influenced by the sea temperature, the writers made a study on the correlation between sea temperature and the crop of this alga in the Province Suttu on the western coast of Hokkaidô and obtained the correlation coefficients: in August r=+0.550; in January r=+0.680 ; in February r=+0.670 and in March r=+0.510. August is the best period for discharging the zoospores in this district, and January to March is the period for the growth of young plants.
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