ON THE TAM INARI ACEAE OF HOKKAIDO 
21 
Matured plants become detached from the substratum one after 
another during winter from November to the next spring. Ger- 
mination of new individuals takes place on rocks in winter from 
about the winter solstice to the middle of January, and they attain 
their maturity in summer. In late winter from the middle of 
February to March, numerous blocks of drift-ice sometimes happen 
to touch coastal sea bottoms and wash away young individuals. The 
plants which may afterwards germinate from spores there would 
be only 3-6 dm long even in the height of summer, and are named 
“Wakaoi,” which means “young growth.” They would first attain 
their maturity in summer the following year. 
Use. This species holds the first place in amount among the 
Japanese fishery products exportable to China. It is poor in sugar 
content but rich in salt content. 
Natural enemies. The growing ground of the present species is 
under the threat of invasion by Alaria yezoensis and species of 
Sargassaceae. 
Addenda. The plants which are commonly called “Kimberi” or 
“Gimberi” are matured individuals of Laminaria longissima which 
bear well developed sporangial sori on almost the entire surface 
of the blade except only along the margins. The sterile margins 
thus assume a color different from that of other fertile parts of 
the blade ; they are yellowish in color in some individuals which 
are hence called “Kimberi”, that means a Laminaria with golden 
margins, or they have a whitish tinge in other individuals which 
are hence called “Gimberi”, meaning a Laminaria with silvery 
margins. “Kimberi” is said to be abundant at Echashi of Hattaushi 
in the village of Atoshizu, and at Takinoshita in the village of 
Chirippu, both in Akkeshi-koshima, while the “Gimberi” is said to 
be abundant at the village of Kiritappu and at Tochirippu in the 
village of Chirippu. Besides the foregoing there are also other 
individuals which are called “Hosome”. They are of a narrow 
blade, only 2-5 cm in breadth, and up to 5 fathoms in length, so 
they appear at a glance to be referable to a distinct species. Such 
a peculiar blade-shape is probably due to mutual hindrance of 
normal growth of several dozens of fasciculate individuals growing 
densely on a single mass of holdfasts. “Hosome” in Nemuro 
Province is said to thrive in a year when damage by drift-ice has 
occurred. It produces sporangial sori on both surfaces of the blade 
