119 



The form I have found (Fig. 93) had commonly a rather well- 

 developed rhizome, from which partly rhizoids, partly assimJla- 

 tion-axes grew out and the 

 last named had sometimes 

 many and closely placed, 

 sometimes few and scat- 

 tered ramuli; these are 

 sometimes opposite or most 

 often alternate or several 

 occur at the same height 

 pointing in different direc- 

 tions. The ramuli are 

 longer or shorter, often 

 nearly cylindric, often also 

 clavate, swollen towards 

 the obtuse apex. As pointed 

 out by Reinke^) the dif- 

 erent parts of the plant are 

 only very little differenti- 

 ated; probably the erect 

 axes can easily be trans- 

 formed to rhizomes and 

 even the ramuli sometimes 

 grow rhizome-like. Caii- 

 lerpa fastigiata and the 

 nearly related, if on the 

 whole specifically separated, 

 C. filiformis, I agree with 

 Reinke in considering as 

 the lowest forms of the 

 genus. 



Only found once in quite sheltered places, St. Jan 

 Geogr. Distrib. West Indies, Brazil, Pacific. 



Fig. 93. CaulerjJd fastigiata Mont. 

 Habit of plant. (About 10:1). 



Cruz Bay. 



2. Caulerpa Vickersii Borgs. 



BoRGESEN, F., in Botanisk Tidsskrift, vol. 31, 1911, p. 129, fig. 2. 



Caulerpa ambigua Vickers, Phycologia Barbadensis, pi. XXXVII. 

 Collins, The green Algae of North America (Tuft College Studies, vol. II, 

 No. 3, 1909, p. 421). Okamura, On the Algge from Ogasawara-Jima (Bonin 

 Islands) in Bot. Magazine, Tokyo 1897, vol. XI, ex parte? 



^) J. Reinke, Ueber Caulerpa. Ein Beitrag zur Biologie der Meeres- 

 Organismen, pag. 7. (Wissensch. Meeresunters., N. F., Bd. 5, Kiel 1899). 



