ON THE BA MIN ARIACE AE OF HOKKAIDO 
29 
A row of mucilage ducts is present in both stipe and blade. 
Habitat and use. The present species is found growing only 
on substrata exposed to a rapid current and at a depth of more 
than four fathoms, so that it is not possible to collect with ease 
any specimens of the plant other than drifting ones cast ashore 
by waves. At Kushiro it grows together with Laminaria yezoensis. 
It contains a considerable amount of iodine and is rich in sugar 
content too. It can be marketed and used for giving flavor to food. 
Addenda. In 1768, Gmerin gave a description of the present 
kelp based on the specimens collected by Steeper on the coast of 
Kamtschatka. Gmeein named it Fucus bifidus. This was the first 
introduction of the present alga to science. In 1848, Ruprecht 
established a new genus, Arthrothamnus, and placed this species in it. 
2. Avtli roth ammi s Jeurilensis Ruprecht 
(Plate 19) 
Ruprecht, Bemerkungen, p. 67, Taf. VI, 1848. 
Illustration. Ruprecht, loc. cit., Taf. VI, 1848; Kitahara, Rakko Ryöba Chösa 
Hökoku, Fig. 2, 1895. 
Japanese name. Chishima-nekoashi-kombu. 
Kidachi-mimi-kombu (named by Dr. Okamura). 
Holdfast composed of filiform hapteres branching several times. 
Stipe, as a characteristic of the species, erect, branching up to 6-7 
times. Branches of the stipe, formed by the development of the 
auriculate outgrowths, twisted once or twice according to their 
length. Sporangial sori formed in one or two rows on the surface 
of the median fascia and the marginal portions. Other characters 
similar to those of the preceding described species. 
Habitat and use. Growing abundantly in the waters around 
Etorofu Island and Uruppu Island. Mr. Shigetada Gunji says that 
a majority of kelps growing around Shimushu Island belong to this 
species. 2 "’ This kelp is rich in sugar content and can be used as food. 
Addenda. This species has been known to science only through 
Ruprecht’s report in 1848 on incomplete specimens collected at 
Uruppu Island. The result of the author’s studies on this and the 
preceding species is planned to be published in another paper. 2 ”’ 
28) However, NAGAI (1940, pp. 100-103) reports that A. bifidus, but not A. kurilensis, 
is occurring in Shimushu Island and other North Kurile islands. 
29) No other paper was published by the author on these species. 
