17 



CORALLINA L. 

 C. officinalis L. 



Stated to be common by Pike, but is rare. 



HILDENBRANDTIA Wardo. 

 H. rosea Kiitz. 



Frequent throughout. 



PERIDINIALES. 



GYMNODINIACEAE. 



GYMNODINIUM Stein. 

 G. fuscum (Ehrb. ) Stein. 

 Brooklyn Water Supply. 



PERIDINIACEAE. 

 CERATIUM Schrank. 

 C. tripos Nitzsch. 



Brooklyn Water Supply, Bates. Queens ; Cold Spring Harbor, 

 Johnson. 



C. longicorne Perty. 



Brooklyn Water Supply. 



PERIDINIUM Ehrb. 

 P. tabulatum Ehrb. 



Brooklyn Water Supply. 



CYANOPHYCEAE. 



CHROOCOCCACEAE. 



CLATHROCYSTIS Henfry. 

 C. aeruginosa Henfry. 



Queens : Glen Cove. 

 C. roseo-persicina Cohn. 



Queens : Cold Spring Harbor, Johnson. 

 COELOSPHAERIUM Naeg. 

 C. Kiitzingianum Naeg. 

 Frequent. 



MERISMOPEDIA Meyen. 

 M. glauca Naeg. 

 Not infrequent. 



NOSTOCACEAE. 

 NOSTOC Vauch. 



N. sphaericum Vauch. 



Kings : Greenwood, Hooper. 



