ON THE EAMINARIACEAE OK HOKKAIDO 
37 
the holdfast, forming a large mass of wrinkles. Marginal portions 
of the blade divided in a pinnate manner deeply toward the midrib 
into narrow and considerably long segments. In an immature in- 
dividual, the segments at the basal part of the blade are crowded 
in a pectinate manner. 
Habitat and use. Distributed in Hokkaido along the coast of 
the Japan Sea from Rumoi in Teshio Province southward, and along 
the eastern coast from Muroran southwestward but not northeast- 
ward ; in Honshu, along the coast of Sanriku district and of the 
Goto archipelago in Higo Province, Kyüshü. The Undaria plants 
distributed along the Japan Sea coast of Honshü are all perhaps 
referable to the present species. This assumption awaits the proof 
of future studies. 3 * 0 The blade of this species can be used as food 
like that of the ordinary “Wakame”, and the sporophylls as a sub- 
stitute for grated yam because they are rich in mucilage. 
Addenda. The present plant has been confused with Undaria 
pinnatifida (Hakv.) Sukingar, as it bears a close resemblance to the 
latter. It was not until the spring of 1901, when the author could 
observe matured specimens of U. pinnatifida from Böshü in Chiba 
Prefecture, that he thought it reasonable to regard this plant as 
a distinct species. Principal characters in which the two species 
differ from each other are as follows. In U. pinnatifida, the sporo- 
phylls are formed on the upper portion of the stipe and keep a 
direct contact with the blade. So the sporangial sori are rarely 
found invading the basal portion of the blade. The sporophylls 
are not in the form of a corpulant spindle as in U. distans, but 
are narrow in breadth, keeping nearly the same diameter through 
the entire length, and wrinkled rather loosely. The blade is divided 
not very deeply, and its segments are short and broad. Young 
segments at the base of the blade just above the stipe are not 
pectinate. 
The plant which was named Alaria pinnatifida by Harvey is 
from Shimoda in Izu Province, and is referable to U. pinnatifida. 
The fertile specimen collected by Kjeet.man at Goto in Hizen 
Province is known from his illustration, to be identical with U. 
distans from Hokkaido, but not with Harvey’s Alaria pinnatifida. 
36) ÖSHIMA (1950) published in Fig. 41 (1) of his work a photograph of a specimen 
of Undaria pinnatifida - type collected in Toyama Bay, on the Japan Sea side of 
middle Honshu. 
