322 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



wards to 11—27 |n in the various filaments. Tlie basal cell in the ra- 

 miili was not so marked and proportionally smaller than in the 

 first-mentioned form. The ramuli were much incurved especially 

 in the upper end of the branches. 



This plant has given me much trouble. I suppose, having not seen 

 any typical specimen af Harvey's plant, that it comes rather near 

 to Dasya ramosissima, but it differs from this by its rosy-red colour 

 and different habitus. From Dasya caraibica it differs not only con- 

 cerning the structure and shape of the ramuli as mentioned above, 

 but also by the fact that Acr. opetigemim, so common on Dasya cara- 

 ibica, was not found on this plant. As the AcrocJiætium-si^ecie& often 

 are closely connected to a single species this indicates furthermore 

 that this form most probably has nothing to do with Dasya caraibica. 



At the islands Dasya caraibica was dredged only in deep water, 

 about 30—50 meters and in rather open sea in places with strong 



currents. 



Found in Uie sound between St. Thomas and St. Jan in several 



places. 



4. Dasya ocellata (Gratel.) Harv. 



Harvey in Hooker, Brit. Flora, vol. II, part I, p. 335; Manual, p. 

 97; Phycologia Brit., pi. 40. Kützing, Fr., Spec. Alg., p. 796. Tabulæ 

 Phycolog., vol. XIV, p!. 61. J. Agardh, Spec. Alg., vol. II, p. 3, p. 1207. 

 Zanardini, Icones Phyc. Adriat., pi. 42 A. Falkenberg, P., Rhodomelaceen, 

 p. 622, pi. 18, figs. 1—4. 



Ceramium ocellatum Gratel., Diss. no. 2, fig. II (non vidi). 



Hutchinsia ocellata Ag. Syst., p. 157. 



Dasya simpliciuscula Ag., Spec, vol. II, p. 122. 



The accompanying figure (Fig. 325) of the apex of a main 

 filament shows the sympodial growth of the plant. We see the vigo- 

 rous side-branch in the stage of bending the apex of the mother 

 branch aside, quite in the same way as the last mentioned has pushed 

 aside the following branch and so on. Of each branch system the basal 

 segment only becomes polysiphonous forming a segment in the main 

 stem ; the remaining parts of the pushed-aside branches form the ramuli . 



According to Falkenberg each branch-system has 5 — 7 seriate 

 side-branches, in my specimens I have mostly found 5 only. The 

 first side-branch, the one constituting the continuation of the main 

 filament, is placed upon the first segment, the following upon every 

 second one. These branches grow out to long monosiphonous filaments 



