110 



form, and sometimes they are furnished with leaf-like wings as in 

 PL. CXXVIII, Fig. 3. According to Mr. Yendo the plants from 

 colder seas are rich in the clavate " rami " while in those from 

 warmer regions the " rami " on the principal members are mostly 

 filiform. The former coincide with the definitions of var. davigvrum 

 H irv. But this character is invalid as Mr. Yendo remarks and 

 many intermediate froms between both extremes are met with. 

 Branches when young are stunted standing in the axils of the "rami " 

 and are beset with several ramuli in a spiral arrangement, thus as- 

 suming the appearence of subfasciculate bunches at the axils ; they 

 gradually develop into branches and fulcrant " rami " are dropped 

 off. This prolongation is restricted to the primary branches only 

 and those of the next order do not elongate. Receptacles (diaeci- 

 ous) are oblong or clavato-cylindrical with rounded apices, clustered 

 in the axils of the "rami." "Colour olive brown. Substance 

 succulent and the plant imperfectly adheres to paper in drying. 



Frond when fully grown often attains the length of one meter, 

 but usually about 30 cm. long with the diameter of 3-4 mm. in the 

 thicker portion. Branches are mostly short, but some are 5-10 cm. 

 long. The plant is diaecious and perennial, but the original or primary 

 frond seems to wither yearly and before it dies the plant shoots out 

 short branches like stolon from the basal portion and on that stolon 

 young fronds are developed. In this country the plant is gathered 

 by people as food material and on this account the duration of life 

 is not easy to make clear. 



Hab. : gregarious on rocks below high tide; very common 

 along the Pacific coast from Kyushyu to Prov. Rikuchyu ; also Tsu- 

 garu str. ; Toppu, Zenigamezawa, Fukuyama, Hakodate (Prov. Oshi- 

 ma, Herb. Sapparo Agricultural College) ; eastern and western sides 



