ON THE liAMINARIACEAE OF HOKKAIDO 
27 
2. K,} oilman iella massif olia Miyabe, sp. nov. (Plate 17) 
Japanese name. Gagome. 
Gagome (Kameda and Kayabe). 
Holdfast composed of filamentous hapteres arising verticillately 
and branching 6-8 times. Stipe solid, smooth on surface, sub- 
cylindrical below, compressed above, 4.5-6.5cm in length, 11.5 mm 
in diameter. Blade lanceolate or linear lanceolate, attaining the 
maximum breadth at a distance of ca. 1/4 of the overall length 
from the base, round at the base; median fascia 1/3-1/4 as wide 
as the entire breadth of the blade, ca. 3 mm in thickness; marginal 
portion adjacent to the median fascia provided along both sides 
of the latter with one narrow longitudinal furrow depressed on 
one surface but protuberant on the other ; gyrate puckerings more 
or less identical in shape with those of Kjellmaniella gyrata but more 
rough and large, becoming obscure on drying ; thick and coriaceous 
in substance, rich in mucilage; 1-2.3 m in length, about 15 cm in 
breadth. Sporangial sori unknown as yet. 25) 
The matured stipe has two rows of mucilage ducts, the outer 
one of which consists of narrow ducts and the inner of broad ones. 
The median fascia of the blade has likewise two rows of mucilage 
ducts, one beneath the epidermis and one just outside the medulla. 
In the latter, the ducts are surrounded by a group of very minute 
cells. The medulla is remarkably thick in the blade. 
Habitat and use. The present species is of quite a limited range 
of distribution. It grows together with Laminaria japonica at a 
depth of 2-5 fathoms, along the coasts extending from Shiokubi 
point, Kameda Gun, to Kayabe Gun in Oshima Province. Fishermen 
harvest this plant and make “Nagakiri-kombu” 2R) to be marketed 
at Hakodate. The amount of production is not large. The superior 
quality product among those made of this species can compare in 
market price with the middle quality one among those made of 
Laminaria angustata. 
None of the known species of Laminriaceae is identical with 
the present plant, so the author proposes to name it Kjellmaniella 
crassifolia as a species new to science. 
25) Kanda (1938, pp. 101-102) reports that the zoosporangia of the present species 
are produced, at first, on one side of the blade, covering the greater part of it, later 
on both sides.” 
26) Cf. MlYAEE, 1902, pi. 39. 
