78 



U. clathrata, Ag. 



Polpis, not very common. 



U. Hopkirkii, Harv. 

 Brant Point. 



U. aureola, Ag. 



Resembles a fine form of U. enteromorpha, or U. clathrata, 

 but the fronds are very slippery, and under the microscope 

 the cells are seen to be arranged in longitudinal series which 

 unite by their edges to form the tubular frond, and are rather 

 easily separated by pressure. This species is not described in 

 any American work on algae. Found on a rock near Brant 

 Point. 



CH^TOMOKPHA, Kiitz. 



C. Linum, Kiitz. 

 Floating in the harbor. 



RmzocLOiauM, Kiitz. 



R. riparium, Harv. 

 R. Kochianum, Kiitz. 

 Both species at Polpis. 



CLADOPHORA, Kiitz. 



C. lanosa, Kiitz. 



Siasconset, L. L. D. 

 C. Rudolphiana, Ag. 



Between tide marks on wharves and mud ; also at Sesachacha 



Pond. 

 C. gracilis, Kiitz. 



Harbor. 

 C. expansa, Kiitz. 



Polpis. 

 C. fracta, Kiitz. 



With the last, but less common. 



