6 
K. MIYABE 
10. Blade short, coriaceous and rigid, sori formed only near the distal 
end of the blade 10. L. coriacea Miyabe 
II. Blade palmately splitted 
A. Mucilage canals present in both stipe and blade 
11. Holdfast composed of fibrous, branched hapteres 
12. L. Ruprechtii (Aresch.) De Toni 
B. Mucilage canals in the blade only but absent from the stipe 
12. Holdfast disk-shaped 11. L. yszoensis Miyabe 
1. Laminaria japonica Areschoug 
(Plate 1) 
ARESCHOUG, Phyceae capenses, p. 29, 1851. 
Illustration. WADA and NOZAWA, Hokkaido Suisan Yosatsu Chösa Hökoku, Plate 
V, 1892 ; SURINGAR, Algae Japonicae, Tab. XI & XII, 1870 ; IWASAKI, Honzo Zufu, 
Vol. 34, Plate XXII, 1828. 
Japanese name. Makombu. 
Makombu (Osatsube), Shinori-kombu (Shirisawabe), Hababiro- 
kombu (Muroran), Oki-kombu (Kikonai), Uchi-kombu (Kikonai), Moto- 
kombu (Shikabe, Kayabe), Minmaya-kombu (Tappi in Mutsu Pro- 
vince), Ebisume (in “Wamei-sho”), Kombu(/w “Honzo Kömoku Keirno”), 
Hirome. 
Holdfast composed of filiform hapteres arising from the lower 
part of the stipe in irregular vertical rows and branching from 
seven to twelve times dichotomously ; several fronds generally 
fasciculate on an entangled mass of holdfasts. Stipe short, thick, 
elliptic or compressed in cross section at the lower portion, becoming 
more flattened and broadened above into the blade, 3-10 cm in 
length, 1.5 x 1.0 cm and 1. 5-2.0 x 0. 4-0.7 cm in elliptic and compressed 
cross sections of the lower portion respectively. Blade entire, 
linear-lanceolate, broad, attaining the maximum breadth in the 
portion a little below the middle of the overall length, gradually 
decreasing in breadth below, round at the base, with the insertion 
of the stipe not at the center of the basal margin ; median fascia 
thick and broad, 1/2 to 1/3 as wide as the total breadth of the 
blade, up to 3-4 mm in thickness ; marginal portions rather thin 
and slightly undulate; up to 1.8-3.5 m, usually 2-2.5 m in length, 
up to 20-35 cm, rarely to 45 cm, usually 25-30 cm in width ; coriace- 
ous in substance ; reproductive organs produced from August or 
