190 



strate decumbent branches, fastened to the substratum by means 

 of haptera. 



As to the anatomy the central strand in the joint commonly 

 consists of 4 rows of cells; these are about 100 /j. long and about 

 12 n broad; the cells in the nodes are almost of the same size, 

 longest in the middle, and growing shorter near the periphery 

 (Fig. 179). 



Tetrasporic conceptacles (Fig. 175, 180) have been found now 

 and then. These are urn-shaped and are produced in the upper 



Fig. 178. Corallina cu- 

 bensis (Mont.) Kiitz. 

 Branchlets ended with 

 small discs. (About 20 : 1). 



Fig. 179. Corallina cuben- 

 sis (Mont.) Kiitz. Longi- 

 tudinal section of the node. 

 (About 200 :1). 



joint of the branchlet. They are rarely destitute of ramuli 

 (horns), mostly bearing 2 5 ramuli verticil! ately placed round 

 the middle of the conceptacle. The conceptacles are about 450 tj. 

 long and 270 // broad. The tetrasporangia are transversely 

 divided, nearly cylindrical or somewhat curved with rounded ends, 

 about ISO// long and 70 // broad. 



Corallina cubensis seems to be rather common along the 

 shores of the islands; it is found in depths from 5 10 fathoms 

 of water and occurs often in the open sea in places where strong 

 currents prevail. It is generally associated with other corallineous 

 algae, e. g. Amphiroa fragilissima and Jania adhaerens. 



