ON THE I , A M IN A UI ACE AE OF HOKKAIDO 
17 
faces, quite irregular in shape, occupying the depressed portions, 
but not the elevated, of the blade. 
This kelp is rich in mucilage, hence it is named “Tororo-kombu” 
in Japanese. 
Mucilage ducts in the stipe very narrow, arranged as a rule 
in a complete circle, but sometimes in a semi-circle, or rarely 
occurring sporadically, while those in the blade arranged in a row. 
Medulla of the blade is rather thick. 
Habitat and use. Growing in water between the low tide-mark 
and the level 1-2 fathoms deep. Distributed from the northern 
part of Shiribeshi Province northeastward along the coasts of Teshio 
and Kitami Provinces, as far as the western coast of Kunashiri 
Island and the interior of Nemuro Bay. The persent species is 
not worth being harvested since its frond is small and inferior in 
quality. 
Addenda. This kind of Laminaria is believed to have been 
unknown to science. So the author proposes here to name it 
Laminaria cicharioides as a new species. 
8. Laminaria angustata Kjellman 
(P late 9) 
Kjellman, in Kjellman and Petersen, Om Japans Laminaria, p. 266, 1885. 
Japanese name. Mitsuishi-kombu. 
Söpaushi (Aino name at Muroran and Shiraoi), Shiohoshi-kombu 
(Esan), Urakawa-kombu, Shamani-kombu, Tokachi-kombu, Dashi- 
kombu (Shiranuka), Mizu-kombu (Hidaka). 
Holdfast composed of filamentous hapteres branching 5-7 times, 
arising in several, up to 5-7 whorls, from the lower part of the 
stipe. Stipe smooth on surface, solid, cylindrical or complanato- 
cylindrical, nearly of the same diameter at both ends, somewhat 
flattened at the portion adjacent to the blade, 3.5-8 cm, rarely up 
to 10 cm in length, 6.5-8.5 mm in diameter. Blade entire, linear, 
cuneate at the base, attaining the maximum breadth at a distance 
of nearly 1/4 of the overall length of the blade from the base, 
slightly undulate on the marginal portions, coriaceous in substance, 
dark brown in color; median fascia only 1/6 as wide as the entire 
breadth of the blade; up to 1. 6-6.5 m in length, up to 5-15 cm in 
breadth. Sporangial sori formed on the marginal portions of the 
