322 



\vards to 11 27 |a in the various filaments. The basal cell in the ra- 

 inuli 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. opetigenum, so common on Dasya cara- 

 ibica, was not found on this plant. As the AcrocfaFtium-specios 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 the 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. KUTZING, FR., Spec. Alg., p. 796. Tabula' 

 Phycolog., vol. XIV, pi. 61. J. AGARDH, Spec. Alg., vol. II, p. 3 ; p. 1207. 

 Zanardini, Icones Phyc. Adriat., pi. 42 A. FALK.ENBERG, P., Rhodomelaceen, 

 p. 622, pi. 18, figs. 14. 



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 

 -I 'lament only becomes polysiphonous forming a segment in the main 

 ->i 'in ; 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 

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

 ti lament, is placed upon the first segment, the following upon every 

 -'< ond one. These branches grow out to long monosiphonous filaments 



