XANTHIDIUM Ehrb. 



X. antilopaeum (Bieb. ) Kutz. 

 Ridgewood Water Supply. 



STAURASTRUM Meyen. 

 S. dejectum Breb. 

 S. brevispinum Brtib. 

 S. aristiferum Ralfs. 

 S. cuspidatum Breb, 

 S. brachiatum Ralfs. 

 S. polymorphum Br€b. 

 S. crenulatum (Naeg. ) Delp. 

 S. punctulatum Br6b. 

 S. pentacladum Wolle. 

 S. Sebaldi Reinsch. 

 S. hirsutum (Ehrb.) Breb. 

 S. Arctiscon Ehrb. 



All more or less frequent in ponds throughout the island. 



EUASTRUM Ehrb. 



E. circulare ( Hass. ) Ralfs. 



Frequent in ponds. 



MICRASTERIAS Ag. 

 M. Torreyi Bail. 

 M. radiosa (Ag,) Ralfs. 

 M. denticulata (Br6b.) Ralfs. 

 M. fimbriata Ralfs. 

 M. Americana (Ehrb.) Kiitz. 



Frequent in ponds throughout the island. 



SPHAEROZOSMA (Corda) Arch. 

 S. filiforme Rab. 



Ridgewood Water Supply. 

 S. spinulosum. 



Ridgewood Water Supply. 

 S. excavatum Ralfs. 



Ridgewood Water Supply. 



APTOGONUM Ralfs. 

 A. Baileyi Ralfs. 



Common. 



DESMIDIUM Ag. 

 D. aptogonium Breb. 



Ridgewood Water Supply. 



HYALOTHECA Ehrb. 

 H. dissiliens (Smith) Breb. 

 Ridgewood Water Supply. 



