296 



series, a single one in each segments; they are mostly placed 



rather clearly in screws. The tetrasporangia are about 60 p broad. 



The plant grows in shallow water near the shore and has 



been found both in sheltered as well as in more exposed localities. 



Fig. 293. Lophosiphonia obscwa 



(Ag.) Falkenb. Upper end of a 



filament. (About 100:1). 



Fig. 294. Lophosiphonia obscura (Ag.) Fal- 



kenberg. Part of a plant with tetraspores. 



(About 20:1.) 



St. Croix: Christiansted's Lagoon, White Bay. The plant has been 

 collected earlier by 0RSTED on the shores of this island. 



Geogr. Distrib. : West Indies, Mediterranean Sea and warmer parts 

 of the Atlantic Ocean. 



