ALGAE IN PHYTOPLANKTON OF THE UNITED STATES 



Table 2. -Commonly occurring genera of algae observed in the phytoplankton of the 



United States - Continued 



._, Number of D „.„ .. 



Genus occurrence' Percent 



Actinastrum 



Pediastrum 



Micractinium 



Schroederia 



Amphora 



Tetrastrum 



Gyrosigma 



Epithemia 



Coelastrum 



Dinobryon 



Pinnularia 



Selenastrum 



Aphanizomenon 



Stephanodiscus 



Chroomonas 



Glenodinium 



Peridinium 



Eunotia 



Chodatella 



Golenkinia 



Cosmarium 



Based on 17,959 samples. 



Table 3. -Dominant genera 1 of algae observed in the phytoplankton of the United States 



Genus Number of p t 



dominances 2 



Nitzschia 



Oscillatoria . 



Cyclotella 



Navicula 



Anacystis 



Melosira 



Scenedesmus 



Lyngbya 



Synedra 



Achnanthes 



Agmenellum 



Anabaena 



Gomphonema 



Fragilaria 



Asterionella 



A nkistrodesmus . 

 Aphanizomenon . 



Diatoma 



Chlamydomonas . 

 Dictyosphaerium 



Cymbella 



Cocconeis 



Crucigenia 



Gomphosphaeria . 



