22 
K. MIYABE 
in autumn. In the shape of sori and in the nature of mucilage 
ducts and other tissues, it does not differ at all from “Naga-kombu.” 
Since this alga is believed to be unknown to science, the 
author proposes here to name it Laminaria longissima as a new 
species. 
10. Laminaria coriacea Miyake, sp. nov. 
(Plate 11) 
Japanese name. Gaggara-kombu. 
Gaggara-kombu (Akkeshi & Kiritappu), Oni-kombu (Kushiro & 
Kombumori), Tachi-kombu (Kiritappu). 
Holdfast composed of filamentous hapteres branching 6-9 times, 
arising from the lower portion of the stipe in whorls, the uppermost 
of which is composed of 8-10 hapteres. Stipe short, solid, sometimes 
becoming furnished with numerous minute protuberances on surface 
with the approach of maturity, cylindrical below, becoming sub- 
terete but showing no marked difference in diameter above, 5-8.5 cm 
in length, 8-10 mm in diameter. Blade linear, round at the base; 
median fascia 2/3— 3/5 as wide as the entire breadth of the blade, 
2.5 mm in thickness ; marginal portion thick, with no undulation ; 
substance coriaceous and coarse, suggesting that the blade may 
be biennial or perennial; 2.5-5 m in length, 8.5-20.0 cm in breadth. 
Sporangial sori formed on both surfaces of median fascia, in a con- 
tinuous patch in lower portion of the blade, divided into two rows 
in the upper portion. The blade is sometimes found to be crowned 
at the apex with a piece of an old frayed blade, which is the 
remnant of the blade that has grown in the previous year and 
bears evident traces of the sporangia! sori. 
Mucilage ducts absent from stipe, but present and arranged 
in one row in blade. Medulla of the blade is thick. 
Habitat and use. Growing in company with Laminaria yezoensis 
and Arthrothamnus bifidus at about 3-4 fathoms depth, and dis- 
tributed along the coasts of the cold current regions from Kushiro 
northeastwards. This species is poor in salt content. Though it 
contains a little sugar, it tastes poor and is not highly regarded 
in the market. Sometimes people would mix this alga with L. 
longissima when they tie the latter’s fronds in bundles for marketing. 
However, a skilled inspector is said to be able to distinguish with 
