ON THE DAMINARIACEAE OF HOKKAIDO 
33 
but revealed by Kjei/e man’s description of the Behring specimens 
to be 20 m at the maximum, up to 86-89 cm in width, attaining 
the maximum breadth at or slightly above the middle of the overall 
length, thin and tender in substance ; midrib composed of a row 
of numerous hollow cavities separated at irregular intervals by 
septa, serving as a buoy because of the air contained in the cavities, 
often making long blades to float in so much abundance on the 
sea surface that a boat sometimes finds difficulty in sailing through 
them and sea mammals often live on them by choice. 
Habitat. Growing abundantly in the region extending from 
Etorofu Island as far north as the Behring Sea, and along the North 
American coasts between Alaska and California ; also on the western 
coast of Saghalien, from where drifting fronds are sometimes 
carried by a current to the coast of Kitami Province in Hokkaido 
and are cast ashore there. Hence the plant is called “Karafuto- 
wakame” in that province. 
Addenda. In 1840, Postet.s and Ruprecht illustrated the Kam- 
tschatka specimens of the present species, and gave it a new 
scientific name. The sporophylls are illustrated by them to be 
linear in shape, rounded at the apex, tapering gradually toward 
the base, and sessile. Comparing them with the same organ of 
our Kurile specimens, the author finds a great difference in the 
morphology between the Kamtschatka specimens and the Kurile 
ones. 
2. Alaria erassifolia Kjeelman 
'P late 22) 
Kjellman, in Kjelj.man och Petersen, Om Japans Laminariaceer, p. 267, Taf. 
X, Figs. 9-12, 1885. 
Illustration. KJELLMAN och PETERSEN, loc. eit, Taf. X, Figs. 9-12, 1885 ; OKA- 
MURA, in Bulletin of the Japan Fishery Association, No. 106, PI. 1, 1891 ; Id., in Bot. 
Mag., Tokyo, Vol. X, PI. 7, Fig. 15, 1896. 
Japanese name. Ero-wakame. 
Sarumen or Sarume (Oshima), Ezo-wakame (ditto), Chikaiso 
(Rikuzen & Rikuchü in Honshu), Chigaisome (Rikuchü), Jikkaisome 
(Rikuzen & Rikuchü), Jikkaiso (Rikuchü). 
Stipe cylindrical, 6.6-16.5 cm in length. Sporophylls linear- 
lanceolate, sword-shaped, crowded, with a short petiole, obtuse at 
apex, rounded at base, coriaceous and thick in substance, with 
fine serrations along the margins and a thin sterile piece of leaflet 
