296 



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



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



rather clearly in screws. The tetrasporangia are about 60 ^ 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.l Falkenb. Upper end of a 



filament. (About 100:1). 



Fig 



..J,. 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 Ørsted on the shores of this island. 



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

 of the Atlantic Ocean. 



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