II. Systematic Part. 



1. Caulerpa verticillata J. G. Agardh. 



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



Till Algernes Systematik, I. p. 6. 

 Weber van Bosse, Monographie des Caulerpes, p. 267. 

 Exsicc. WiTTROCK & NoRDSTEDT, Algæ exsicc. No. 1020. 



Collins, Holden and Sktchell, Phycotheca Bor. Am., No. 665. 



f. typica. The opposite or verticillata ramuli, arranged in distinctly separate 



whorls. (Fig. 1.) 

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



shoot '). (Fig. 2.) 



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

 in the more sheltered places. Its real home is the lagoons, where as I have already 

 mentioned in my paper 

 (5, p. 55—56) it is one of 

 the most common algæ 

 in the very characteristic 

 algal vegetation, which 

 covers the mangrove roots. 

 As a dark-green 6 — 7 cm. 

 high covering it grows 

 quite dense on the man- 

 grove roots and like 

 most of the other richly 

 ramified mangrove algæ 

 gradually collects mud 

 and organic particles be- 

 tween its fine ramifica- 

 tions, and that often in 



such great quantities that Pi^ j caulerpa verticillata .1. Ag. 



the water immediately From the lagoon of Christianssted, St. Croi.\. (l'I^:!.) 



') A type-specimen of this form, Harvey, Friendly Islands Algæ, No 97, to be found in the Botanical 

 Museum of the University of Copenhagen, has however the ramuli rather distinctly arranged in whorls. 

 Harvey's paper, List of Friendly Islands Algæ, 1 have not been able to see. 



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