iS 



XXI, f. I ; Borgesen An Ecol. and System, ace. of the Danish W. Incl. 

 (Mem. Aad. Roy. d. Sc. etc.) 1907, p. 357, f. 4. 



Fronds small with erect shoots bearing distichous rows of 

 opposite ramenta, 5-10-13 mm. long. Our specimens being dried 

 and pressed the compressed habit of frond is not clear ; but 

 ramenta are compressed with the flat surface on the same plane 

 with that of shoot. Ramenta are wedge-shnped with the broadest 

 end turned outward, and several times dichotomously divided 

 ending in a small spine, very widely parted ; the broadest distance 

 between the extremities of ramenta on both sides is i-i.S mm. 

 The erect shoots show a very distinctly rhythmical growth of 

 ramenta, as Borgesen states ; thus every set of 3 or 4, sometimes 

 5 or 6 continuous pairs of ramenta gradually decrease in lengths 

 from below upward, alternating in a regular sequence. 



Hab. : Ogasawara-jima (col. Fujimori). 



PL. CLV, fig. 5-8. Fig. 5: frond of Canlcrpa Wcbbiana Mont. f. 

 disticha Web.-v. Bos., 10 - Fig. 6: growing apex of aerial shoot, *-. Jrig. 

 7-8 : two aerial shoots showing rhymtheic growth of ramenta, J- 3 . 



Caulerpa Webbiana Mont. f. disticha Weber van Bosse 1 ' 



; tf l- b o' K ' - ift li 



^ CLV IB JK, 5-8 IB- 



& ? , ( at * /" tg ^ J * A' 



=- m - m ? 



H ^ /o J{ ^ CX1X |B JR, 6-9 |B * I W ^ b -> te 7 >' . 



