adheres to paper in drying. Colour yellow brown, turning to 

 blackish in drying. 



Had.: On fronds of several plants such as Sargassum, Phyllo- 

 spadix etc, rarely on stone (?), extending from tide marks to 1-2 

 fathoms. Provs. Awa, Mikawa, Rikuzen, Rikuoku, Noto, Sado and 

 Kitami ; Seishin (Chosen). 



On referring the plant in question to the present species, I 

 have not been able to see any reliable specimens. But from the 

 illustrations given by Harvey in Phyc. Austr. tab. 60, and the 

 descriptions given by him and J. Agarclh, I think I am justified 

 in doing so. Harvey states that the plant has a percurrent stem, 

 but J. Agardh that it branches deliquescently. Again, Harvey 

 mentions that the axile cylinder is formed of very densely com- 

 pacted and agglutinated longitudinal filaments exactly as in Clwr- 

 daria and J. Agardh that " cellulis exigua distantia juxtapositis 

 ambitu rotundatis, amplioribus et fere duplo tenuioribus sine ordine 

 adparente intermixes." These statesments are somewhat at varians 

 with ours, though in our plants all of the longitudinal cells are not 

 of exactly equal diameter and some have narrow calibres, yet the 

 cross-section of frond shows them to be much more regular than 

 that of C. flagclliformis and to be much loosely packed together. 



The near allies among our plant is Ch. fir ma PL. CXLIII 

 from which it differs in many points especially in the soft sub- 

 stance, mode of branching, habit of growing on algae instead of 

 on stone and structure of frond. Though by those differences the 

 two plants are easily distinguishable from each other, yet in some 

 cases there are some specimens very difficult to separate one from 

 the other. In different localities and ages the plant much varies in 



