51 



St. Thomas: In the Harbour at the 

 French wharf; St. Jan: Cruz Bay; St. 

 Croix: Lt. Princess. 



Geogr. Distrib. Siam. 



Siibfam. A. Siphonocladeae. 

 Struvea Sond. 



1, struvea elegaus Bergs. 



BoRGESEN, F., Some Chlorophyceaj from 

 the Danish West Indies, II (Botanisk Tids- 

 skrift vol. 32, 1912, p. 264). 



This very nice plant was found 

 rather abundantly in deep water in the 

 sea around St. Jan. In habit and 

 size it comes near to Str. pluinosa but 

 shows differences in several ways, hav- 

 ing also some likeness with the fol- 

 lowing species. 



The basal part of the plant con- 

 sists of decumbent creeping fdaments 

 attached to the substratum by means 

 of rhizoids. These rhizoids are very 

 irregularly ramified, sometimes quite 

 short, sometimes also longer, irregu- 

 larly septated. They are richly pro- 

 vided with starch. 



From the creeping filaments grows 

 the erect part of the thallus, the stalk 

 crowned with the frond. From its 

 earliest stage of development the stalk 

 consists of a single, nearly cylindric 

 cell. At its base, at least in more 

 mature specimens, we find a few, 6 — 8 

 annular corrugations though not very 

 deep (Fig. 37). When the stalk has 

 reached nearly the normal height of 

 the plant it divides into a number 

 of cells. The forming of these cells 

 is said by J. Agardh (I.e. p. 108), Yig. 37. Struvea degans Borgs. 

 who founds his description on that of A young plant. (About 3:1). 



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