121 



choiisly arranged ramiili, only very seldom a single or few ramuli 

 are found with a different arrangement (comp. Fig. 94 and Vickers, 

 1. c, pi. 37, figs. 3 and 6). The ramuli are opposite or sometimes 

 also alternating; they are of varying length, from rather short 

 (2 — 3 times as long as broad) to long and cylindrical (4 — 5 times as 

 long as broad); they are not constricted at their base and have a 

 rounded apex. 



The largest and most vigorous ramuli are furthermore distin- 

 guished by having their apices bipartite or even tripartite (comp, 

 Vickers, 1. c. fig. 6). The plant shows a rather distinctly periodic 

 growth; every fifth or sixth pair of ramuli are more vigorously 

 developed and furcate; from these the next decrease gradually in 

 size, they are most often still furcate, while the 3rd — 4th next 

 pairs of ramuli are simple. 



The thickness of the erect axes is about IbO/j, that of the 

 ramuli about 100;^ and the length of the ramuli up to 450/-?. While 

 Okamura placed his species by reason of the constricted or arti- 

 culated rachis in the group of Sedoideie, where we also find it in 

 the Monograph of M™<' Weber-van Bosse, I think that our plant 

 comes very near to Caiilerpa fastigiata, with some forms of which 

 (comp. Vickers, 1. c, pi. 36, figs. 3 — 4) it seems to be closely related. 



Caiilerpa Vickersii was found growing entangled among Bry- 

 opsis upon rocks near the surface of the sea and in a somewhat 

 sheltered locality. 



Found only once: St. Jan, Cruz Bay. 

 Geogr. E)istrib. Barbados, Bonin Islands (?). 



3. Caulerpa verticillata J. G. Agardh. 



J. G. Agardh, Nya alger fran Mexico, p. 6, the note. J. G. Agardh, 

 Till Algernes Systematik, I, p. 6. Weber-van Bosse, Monographic des 

 Caulerpes, p. 267. Borgesen, An ecological and systematic account of 

 the Caulerpas of the Danish West Indies (K. Danslce Vidensk. Selsk. Skr., 

 7. Rk. Naturv.-math. Afd. IV, 5, 1907, p. 365). 



Exsicc. WiTTROCK & NoRDSTEDT, Alg83 exsicc. No. 1020. Collins, 

 HoLDEN and Setchell, Phycotheca Bor. Am., No. 665. 



f. typica. The opposite or verticillate ramuli, arranged in di- 

 stinctly separate whorls. (Figs. 95 and 96). 



f. charoides (Harv.) Web. v. Bosse. The ramuli are scattered 

 over the erect shoot^). (Fig. 97). 



This nice little plant is very common on the shores of the Danish 

 West Indies in the more sheltered places. Its real home is the 



^) A type-specimen of this form, Harvey, Friendly Islands Algaa, No. 97, 



