22 ART. 1:^. — K. YKXDO. 



The tyj^ical plant has no true vesicles. But a few blister- 

 like elevations are often met with in an upper branchlet or 

 below a dividing point. In such cases they extend throughout 

 the whole diameter of the segments concerned and are ovate or 

 much elongated. This character is seldom met with in those 

 specimens which were collected in the vicinity and southward of 

 the Tsugaru Strait (PJ. I. fig. 4. a) ; but iu those from colder 

 parts, the ampulation becomes much more frequent, tending 

 to a fixed character, and suggests gradual inclination to the 

 next forma. 



/. Hahinfjfonii form. nov. 



Diagnosis. Fronde angustiore compresso-plaiui decoiiiposite dichotoiiiu fasti- 

 giata; vesiculis oblongis compressis in ramis superioribuis infra axilla.s 

 immersi.s ; receptaculis linearibus terniinalibus complanatis !<in)plicibiis 

 vel furcatis. 



=Fuciis Babingtonii Hakv.: Charact. of New Alg. p. 329. 

 =Peluetia Babingtonii De Toxi: Öyll. Alg. III. p. 216.— /f/.: I'liyc. 

 Jap. Nov. p. 48. 



The present forma differs from the preceding in having the 

 vesicles constant. The vesicles are oblongo-linear, situated below 

 the bifurcating j^oints, and having diameters slightly larger than 

 the breadth of the segment in which they are found. In the 

 dried specimens they are apt to be over-looked owing to the 

 collapse of the elevated surfaces. The plants which come under 

 this cateaorv attain, as far as I can ascertain, hardlv two feet 

 in total length. Even the largest of the specimens is nuich 

 inferior in size to the type specimen. 



Fucus Babinglonii has been assigned by Hakvj:y to the 

 coast of Bimoda as well a^ to that of Hong-kong. It is beyond 

 doubt that there is some mistake concermng the localities. The 

 present forma and its sisters are found exclusively in the colder 



