ON THE LAM1NARIACEAE OF HOKKAIDO 
13 
of scattered clouds on the marginal portions upwards, but on the 
median fascia usually in a continuous patch even towards the apex, 
sometimes also in discontinuous spots here and there. 
Stipe has a row of mucilage canals. The canals in the blade 
are arranged in two rows at the median fascia, but in one row 
at the marginal portion. The inner canals of the median fascia 
are larger in diameter than the outer ones, and sometimes are 
replaced by masses of small cells. The medulla is thin, consisting 
chiefly of vertical rows of filamentous cells. 
Habitat. Growing in water one to two fathoms in depth within 
calm bays situated in the cold current region. Distributed from 
Akkeshi, Kushiro Province, eastwards, as far as along the coasts 
of the Nemuro Peninsula and of Etorofu Island, Kuriles. Nothing 
definite is known now about the presence or absence of this species 
in the northern region beyond Etorofu Island as it lies outside the 
area of the author’s researches. 13) 
Use. This species was once used to make “Hanaori-kombu” 
and ‘'Motozoroi-kombu” IJ:> with its middle part of the blade stripped 
of the fragile marginal portions. But it can hardly meet the market 
demand because of its inferior quality. At Akkeshi and its neigh- 
bourhood this alga is used for the manufacture of iodine. 
Addenda. . The present species most closely resembles L. japonica 
of Oshima Province. However, it can easily be distinguished from 
the latter since there are some marked differences in their outer 
and inner structures. None of the known species is considered to 
have characters identical with the plant in question, so the author 
proposes here to recognize it as a new species naming it Laminaria 
diabolica in accordance with the meaning of its common Japanese 
name “Oni-kombu.” 
5. Laminaria longipedalis Okamuka 
(P late 5) 
OKAMURA, Laminaria of Japan, p. 89, pi. VII, figs. 1-3, 1896 
Illustration. Okamura, loc. cit., pi. VII, figs. 1-3. 
Japanese name. Enaga-kombu. 
13) Nagai (1940, pp. 71 74) reports that Laminaria diabolica grows in the Kuriles 
on the coasts of Kunashiri Isl. and Etorofu Isl. only. 
14) Hanaori-kombu and Motozoroi-kombu are illustrated in MlYABE’s work (1902), 
pi. 33, figs. 11-12, pi. 35, fig- 4 and pi. 33, figs. 1 10. pi. 35, fig. 1 respectively. 
