Table I 



ALGAL GENERA IDENTIFIED IN RAW SAMPLES 

 (Number indicates approximate rank of importance according to volume) 



Genera 



Yellowstone R. 

 @ Custer 



Bighorn R. 

 @ Bighorn 



Yellowstone R 

 @ Myers 



CHLOROPHYTA 



Cladophora 



Microspora 



Mougeotia 



Oedogonium 



Spirogyra 



Ulothrix 



CHRYSOPHYTA 



Achnanthes 



Bidduiphia 



Caloneis 



Cocconeis 



Cymatopleura 



Cymbella 



Diatoma 



Epithemia 



Fragilaria 



Gomphonema 



Gyrosigma 



Hannaea 



Melosira 



Meridion 



Navicula 



Nitzschia 



Rhoicosphenia 



Surirella 



Synedra 



RHODOPHYTA 



Audouinella 



CYANOPHYTA 



Oscillatoria 

 Spirulina 



1 

 Ik 



13 



15 



26 



19 



24 

 12 



21 



8 



5 



17 



6 



? 

 22 



18 



23 

 25 



3 



10 



16 



9 



11 



2 

 20 



12 



13 



10 



5 



3 



b 



2 



8 



lb 



9 

 1? 



11 



14 



12 



13 



21 



5 

 19 



9 

 16 



7 



8 

 10 



17 

 18 

 20 



2 



3 

 14 



11 



15 



■8- 



