116 ART. 12 K. YENDO. 



quite short, rarely attaining ocm. in length, and are densely beset 

 with abbreviated ramulets. Vesicles are oblongo-obovate, with a 

 long stalk at the base and apiculated at the top. They are 

 evidently inflations of the uj^per portions of the filiform leaves. 

 Keceptacles are cylindrical, more or less narrowed above, with a 

 short stipe, and disposed in a racemose manner. Some specimens 

 found in the vicinity of Nagasaki had the lateral branches as 

 long as several centimeters and the receptacles measured 1 cm. in 

 length with a diameter of a little over 0.5mm. The vesicles 

 together with the receptacles are, as in the other formie, generally 

 limited to the abbreviated ramulets or to the terminal portions 

 of the branches. The stems of the princij)al branches are ridged 

 and measure 1.5-2 mm. in thickness in the middle portion. 



Forma latifolia lives in the colder seas and is found on the 

 coast of Hokkaido as far north as Etorofu Island. Its southern 

 limit is near Kinkwasan Island, a little south of 40° N. latitude. 

 The fulcrant leaves, i.e., the leaves on the principal branches, are 

 lanceolate, and often as wide as 3 mm. Those on the lateral 

 branches are complanated, subulato-lanceolate and usually have 

 a few cryptostomata. On an average they measure ca. 0.5 mm. 

 in width and 5 mm. in length. In the specimens from northern 

 localities they apparently tend to have a greater width. In the 

 specimens from the east coast of Hokkaido, tliese narrow lanceo- 

 late leaves are no longer found on the lower portions of the frond 

 and in their place there are obliquely cuneate or spathulate leaves, 

 6-7 mm. long and o-4 mm. wide. The assigning of Sargassum 

 hemiphyllum to the northern part of Hokkaido may have been 

 due to an erroneous identification of this forma. The vesicles 

 begin to appear after the plant has gro\yji more than a foot in 

 height. At the beginning they are nothing but slight inflations 



