F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



187 



together with Jania adhærens and Corallina cubensis, covers 

 large extensions. 



It is a favoured refuge of many small algæ which find a 

 comparatively quiet growing place among its rigid filaments. 

 Besides many red algæ, e. g. Hypnea, Spyridia etc., Cladophoropsis 

 membranacea especially settles itself here and often grows 

 so vigorously here that it quite covers the host plant and 

 together with it forms quite thick carpets on the rocks over 

 which the surf constantly breaks. The small forma reducta of 

 Caulerpa racemosa, mentioned in Vol. I, p. 151 was found in 

 such a locality growing between Amphiroa fragilissima and in 

 Fig. 123 in the same volume the var. occidentalis of Caulerpa 

 racemosa is shown creeping between the densely felted filaments 

 of this alga. 



It has been collected with tetraspores in January — March. 



Geogr. Distrib. : West Indies, Indian Sea. 



Corallina (L.) Lamx. 



1. Corallina cubeusis (Mont.) Kiitz. emend. 



KüTziNG, Tabulæ phycologicæ, vol. 8, p. 37, pi. 77, figs, e, f (non fig. d). 

 Jania cubensis Mont, in Kützing, Species Algarum, 1849, p. 709; 

 MoNTAGNE, Sylloge gen. specierumque Cryptogamarum, 1856, p. 429. 



Up to the present day this species has been considered a 

 doubtful one and it cannot be denied that the description of 

 MoNTAGNE is, indeed, very poor and even 

 misleading. 



It is described previously in Kützing's 

 *'Species Algarum"; the diagnosis, the 

 same, that is found in Montagne's "Syl- 

 loge", 1849, p. 429, reads verbatim: "J. 

 intricata, subsetacea, filiformis, teres, al- 

 terne ramosa vel subdichotoma, ramis 

 subpinnatis, pinnis ciliiformibus paucis 

 patentibus subulatis ; articulis elongatis, 

 diametro 4 — 6 plo longioribus, primariis 

 clavatis, pinnarum cylindricis. Alt. ^2"". 

 — Cuba (v. s.). — "Spec, dedit cl. Mon- 

 tagne", is added by Kützing. 



This description might agree in some fj^") Km™" Habf o"1 

 points with my specimens, but it disagrees plant. (About 6 : 1). 



