36 
K. MIYABE 
fine transverse corrugations on the surface which are not so con- 
spicuous as in the preceding species, 33 cm in breadth at the widest 
portion; midrib solid, linear-oblong in cross section, up to 1.5cm 
in width. 
Habitat. Only a single specimen from the eastern coast of Kuna- 
shiri Island, Kuriles, is at hand. But none of the known species 
has ever been described to have so large sporophylls in company 
with a corrugate blade as this specimen does. So the author 
assumes it provisionally as new to science and proposes to name 
it Alaria macrophyllar 
6. Undaria Suringar 
SURINGAR, Illustr. Alg. du Jap., p. 77, 1873. 
Stipe is flattened and bears an undulate wing along both sides. 
With the advance of the maturity of the plant, a part of the wing 
develops and changes into a markedly wrinkled sporophyll, which 
produces sporangia! sori on its entire surface. The sori are some- 
times found to spread over the base of the blade. Blade has a 
midrib, and is divided pinnately in the marginal portions. The 
blade lacks mucilage canals, but is provided with cryptostomata. 
In the genus Undaria are included two species viz., U. pinnatifida 
and U. distans . 35) 
Undaria distans Miyabe et Okamura, sp. nov. 
(Plate 26) 
Illustration. KjELLMAN och PETERSEN, Om Japans Laminariaceer, Taf. XI, 1885; 
Okamura, in Bot. Mag., Tokyo, Vol. IV, PI. 2, 1890. 
Japanese name. Nambu-wakame (in Suyama’s Yuyo-sofu, 1900). 
Wakame (Hokkaido). 
Holdfast composed of filiform hapteres branching several times. 
Stipe longer in comparison with that of U. pinnatifida, sometimes 
up to more than 66 cm in length. Sporophyll produced just above 
34) YENDO (1919, p. 79) placed Alaria ma.crophylla MIYABE in the list of synonyms 
of Alaria macroptera (Rupr.) YENDO without giving any remarks. Dr. Miyabe is in 
agreement with Yendo’s views. ( Cf . MIYABE and NAGAI, 1933, p. 99; MIYABE, in 
Okamura, 1936, p. 297). 
35) Miyabe [in Okamura, 1936, p. 300) is of opinion that U. distans is a 
distinct species, but OKAMURA (1902, p. 128, 1916, p. 166, 1926, p. 118, 1936, p. 282) 
reduces it to a local and ecological form of U. pinnatifida, as f. distans MIYABE et 
Okamura. 
