DICTYOSPHAERIUM Naeg. 

 D. Ehrenbergianum Naeg. 

 Frequent. 



PLEUROCOCCACEAE. 



PLEUROCOCCUS Menegh. 

 P. vulgaris Menegh. 

 Common throughout. 



RAPHIDIUM Kiitz. 

 R. polymorphum Fres. 

 R. convolutum (Corda) Rab. 

 Both frequent. 



SCENEDESMUS Meyen. 

 S. caudatus Corda. 

 S. dimorphus Kiitz. 

 Both frequent. 



POLYEDRIUM Naeg. 

 P. longispinum Ehrb. 

 Frequent. 



STICHOCOCCUS Nag. 

 S. bacillaris Nag. 



Queens : Cold Spring Harbor, Johnson. 



HYDRODICTYACEAE. 



PEDIASTRUM Meyen. 



P. Boryanum (Turp. ) Menegh. 



Ridgewood Water Supply. 

 P. pertusum Kiitz. 



Ridgewood Water Supply. Queens : Glen Cove. 

 P. Ehrenbergii (Corda) A. Br. 



Kings : Prospect Park, Ridgewood Water Supply. 



COELASTRUM Naeg. 

 C. microporum Naeg. 



Ridgewood Water Supply. 



HYDRODICTYON Roth. 

 H. utriculatum Roth. 



Not infrequent throughout. 



ULVACEAE. 



MONOSTROMA (Thuret) Wittrock. 

 M. Grevillei (Thuret) Wittr. 



Kings : College Point, Pike. Suffolk : Sag Harbor, Pike. 



