317 



Rhodonema elegans Martens, Reise, II, p. 641, tab. VIII. 



Dasya Kiitzingiana Biasoletto in Linnaea. vol. XI, 1837, p. 477, pi. VIII 

 and IX. KUTZING, Phycol. gen., p. 414, pi. 51, II, figs. 1 4; Tab. Phycolog., 

 vol. XIV, pi. 60. 



For more synonyms see DE-TONI, Sylloge Algarum, vol. IV, part III, 

 p. 1201. 



This fine plant is found at the islands in deeper water, about 

 20 40 meters, and seems at this depth to be common. 



Referring for details to FALKENBERG'S exhaustive description 

 I just want to mention here that the summits of each branch-system 

 of the sympodium (the ramuli as I call them) are placed with a diver- 

 gency of about V. Later on from the surface cells of the very early 

 developed cortical layer numerous adventitious branchlets are de- 

 veloped ; these are placed quite irregularly and often cover the main 

 filaments very densely. 



The stichidia are developed at the summit of the unbranched 

 filaments of the ramuli. The stichidia are linear-lanceolate running 

 out in an acute sterile apex; five sporangia are present in each 

 joint. 



The cystocarps are developed upon the ramuli whose basal 

 parts then becomes polysiphonous. They are urceolate of shape, 

 often somewhat oblique with a rather long and narrow neck. 



Dasya pedicellata has been found in more open sea and rather 

 deep water mostly in places where rather strong currents prevail. 

 Specimens with tetraspores and cystocarps were found in the month 

 of March. 



Found in many places in the sound between St. Thomas and St. 

 Jan, and in the sea to the north of the last mentioned island: off Ame- 

 rica Hill. 



Geogr. Distrib.: West Indies, the warmer Atlantic shores of North 

 America and Europe, Mediterranean Sea. 



2. Dasya mollis Harv. 



HARVEY, W. H., Nereis Bor. Am., Part II, p. 62. J. AGARDH, Spiv. 

 Alg., vol. II, pars 3, p. 1216; Till Algernes Systematik, XI Florideae, p. 104. 

 KUTZING, F., Tab. Phycol., vol. XV, pi. 1. 



A few, not very w r ell developed specimens (No. 2131) have been 

 found. Characteristic of this species is the rather quick tapering 

 of the ramuli from a very robust base. In the present form (Fig. 

 321 a) the bases of the ramuli were about 50 |u thick. In some of the 

 ramuli a short basal cell, nearly quadratic, was found, in others the 

 basal cell was rather long, reaching a length of about 110 \i. In the 



