55 



Grateloupia divaricata Okam. 



Nom. Jap. : Kata-nori, 

 PL. CXVI CXVII, Fig. 12-18. 



Grateloupia divaricata Okam. New or little known Algae 

 from Japan (Bot. Mag. Tokyo Vol. IX, No. 106) No. i, PI. IX, f. 



1-2. 



Fronds numerous from a common callous disc, each rising with 

 a single stem, 7-20 cm. high, rarely 30 cm. or more, narrowed at 

 its base, soon becoming compressed and afterwards preserving 

 everywhere a nearly equal width of 1-1.5 mm - (rarely 3 mm. or 

 more) till, approaching to the apices, it again grows narrower, and 

 ends in a sharpish point. Stem is undivided at the base for a 

 more or less long distances, then becomes divaricately dichotomous, 

 the distance between the lower dichotomies being longer than that 

 between the upper ones. Sometimes the ramification is more re- 

 gularly dichotomous in somewhat flabellate manner, but more 

 usually it is irregular, irregularities being assisted by divaricately 

 decompound segments and by large secondary branches, which has 

 developed from proliferations, either simply elongating or similarly 

 dichotomo-decompounded as other portion of frond. In some speci- 

 mens, segments expand somewhat beneath the forks, being slightly 

 -analiculated. All the branches are beset on both sides (some few 

 ones from surfaces) with proliferous ramuli, usually 1-2 cm. long, 

 distichous, scattered, some standing nearer to each other in secund 

 manner, others rather remote ; some remain simple and short, 

 others forked. Proliferations are linear constricted at base, taper- 

 ing at apex. Terminal segments often elongate. Structure of the 



PL. CXVI CXX, December, 1913. 



