12 
K. MIYAKE 
also provided with a row of mucilage canals which are narrow as 
compared with those of other species. The medulla of the blade 
is very thin, and its scanty filamentous cells are located between 
thick-walled parenchymatous cortical cells. 
Habitat. Growing in water 1-2 fathoms in depth along the 
coasts facing bays and washed by calm waters. Found in the 
vicinity of Daiba or the fort 12) in Hakodate Harbor, in Muroran 
Harbor and at Oinaushi, Muroran. 
Use. This species is rich in salt and iodine contents. Its Aino 
name “Yayan” means a useless thing, and seems to suggest its 
uselessness due to the high content of salt. It is reported to be 
exported in a small total quantity to China of late years. 
Addenda. Among the hitherto known species of Laminaria 
characterized by the presence of mucilage canals in both stipe and 
blade, not even a single species can be found to which the plant in 
question is referable. So the author proposes here to name it 
Laminaria fragilis as a new species. 
4. Laminaria diabolica Miyabe, sp. nov. 
(Plate 4) 
Japanese name. Oni-kombu. 
A 
Oni-kombu (Kushiro, Nemuro), Hababiro (Kushiro), O-hababiro- 
kombu (ditto), Ita-kombu (ditto), Hanaori-kombu (ditto), Motozoroi- 
kombu (ditto). 
Holdfast composed of filiform hapteres arising from the lower 
part of the stipe in irregular vertical rows, branching seven to 
nine times dichotomously. Stipe smooth on surface, solid, round 
or broad-elliptic in cross section below, complanate and broadened 
upwards, 6.5-12 cm in length, 12-15 mm in diameter near the base. 
Blade entire, linear-lanceolate in shape, very broad, round at the 
base, up to 2.S-4.5 m in length, up to 25-45 (46) cm in breadth ; 
median fascia remarkably thick, sometimes up to 43 mm or more, 
1/2— 1/4 as wide as the whole breadth of the blade; marginal portions 
thin, markedly undulate, fragile when dried. Sporangial sori 
formed on both surfaces of the blade, covering nearly entire sur- 
faces below, becoming irregularly discontinuous and in the form 
12) The fort in Hakodate Harbor in those days was situated at the place which 
the Hakodate Dockyard occupies today. 
