8 
K. MI VA HR 
Natural enemies P Phyllospadix Scouleri j" Alaria crassif olia, Costaria 
Turneri, Undaria distans, and Sargassaceous plants are to be listed 
here. 
2. Lmninaria ochotensis Miyabk, sp. nov. 
(Plate 2) 
Japanese name. Rishiri-kombu. 
Rishiri-kombu (Rishiri and Rebun), Makombu (ditto), Koteshio 
(Rumoi), Hosome-kombu (Teshio and Kitami), Shio-kombu (Rishiri 
and Rebun), Para-kompo (Aino name at Abashiri), Dashi-kombu 
(Kitami and Abashiri), Menashi-kombu, Birödo-kombu (Menashi), 
Teshio-kombu, Kuro-kombu. 
Holdfast composed of filiform hapteres arising from the lower 
part of the stipe in four or five vertical rows, branching from eight 
to nine times dichotomously ; seven to twenty fronds fasciculate 
on a mass of holdfasts, but in a narrow form called “Hosome,” 
twenty to eighty or ninety fronds are usually found to grow in 
a cluster. Stipe short, smooth on surface, elliptic or round in cross 
section at the lower portion, becoming flattened and broadened 
above into the blade, 3-10 cm in length, 1-1.5 cm in diameter at 
the lower portion. Blade entire, linear-oblanceolate or linear- 
spindle in shape, usually cuneate, but rarely round or cordate in 
plants growing sparsely, at the base ; median fascia thick and 
broad, 1/3 as wide as the entire breadth of the blade ; marginal 
portions thin and slightly undulate ; coriaceous in substance and 
rich in mucilage ; blackish-brown in color when matured, hence the 
plant is called “Kuro-kombu”; at the transition place bending 
nearly at right angles in a frond growing on the sea bottom; usually 
1. 5-2.7 m, but in some localities up to 9-13.5 m in length, 15-30 cm 
8) Dr. Miyabe (1902, p. 13-14) states in his introductory remarks under the heading 
of “Natural enemies” as follows : “The natural substrata good for the attachment of 
Laminaria are limited in their capacity. It is not uncommon to find them having 
been invaded by luxuriant growths of other seaweeds. Species of invaders vary 
according to the locality. For instance, Lam/inaria japonica finds its competitors in 
Phyllospadix, Alaria crassif olia, Costaria, Undaria, Sargassum, etc., whereas L. longis- 
sima in Alaria yezoensis, Costaria, etc.” 
9) The species of Phyllospadix distributed in Hokkaido was once referred by 
MAKINO (1899) to Phyllospadix Scouleri HOOKER, a Pacific species of North America. 
However, MiKl (1933) states that the so-called Phyllospadix Scouleri in Japan is nothing 
but Phyllospadix iwatensis MAKINO (1931). 
