ON THE I.AMINAKIACKAH OB’ HOKKAIDO 
19 
level at about seven fathoms depth, along projecting coasts washed 
by a strong cold current mingled somewhat with a warm current. 
Distributed along the coasts from Shiranuka, Kushiro Province, 
southwestwards as far as Muroran, and occurring at Cape Esan, 
Oshima Province. Growing most luxuriantly along the coasts of 
Hidaka Province. 
Use. The species in question is used in the western provinces 
of Honshu for the manufacture of shredded kombu (“Kizami- 
kombu”), and is also exported to China in considerable amount. 
It is known to be rich in iodine content. The plants produced at 
the localities west of Samani and Urakawa are more rich in sugar 
content as compared with those from Biroo and Horoizumi. 
Natural enemies. On flat reefs in Hidaka Province, Phyllospadix 
is a tremendous menace to the growth of this Laminaria while the 
plants on uneven rocky bottoms along projecting coasts at Esan, 
Muroran and Erimo are exposed to the menace of Costaria, Sargassum, 
Alaria yezoensis and A. crassifolia. 
Addenda. The present species resembles Laminaria longissima 
of Nemuro and Kushiro Provinces in some respects, but differs 
from the latter in the position of the sporangial sori, in the pos- 
session of discontinuous mucilage ducts, and in general appearance 
of the frond. 20) Accordingly it can easily be distinguished at a 
glance from that species. The scientific name for this species was 
given by Kjeeeman. 
9. Laminaria longissima Miyabe sp. nov. 
(Plate 10) 
Illustration. Wada & N OZAWA, Report on the Preliminary Survey of Fishery 
in Hokkaido, Plate V, 1892. 
Japanese name. Naga-kombu. 
Ma-kombu (Kushiro, Nemuro), Nimotsu-kombu (Kushiro), Gim- 
beri-kombu (Kushiro, Nemuro), Kimberi-kombu (ditto), Mizu-kombu 
(ditto), Hosome (ditto), Shima-kombu (ditto). 
Holdfast composed of filamentous hapteres branching 4-8 times, 
arising from the lower part of the stipe, in 4 to 7 quite irregular 
20) OKAMURA (1936, pp. 252 253) holds the view that the present species and the 
next are one and the same species. MIYABE (in OKAMURA, 1936, p. 2S7j reduced 
the next described species to a variety of the present as var. longissima (Miyaee) 
Miyabe. 
