Class Genus Species No. Strain No.
Chrysophyceae Ochromonas 
Prymnesiophyceae Ochrosphaera 
Bacillariophyceae Odontella 
Chlorophyceae Oedogonium 
Raphidophyceae Olisthodiscus 
Ulvophyceae Oltmannsiellopsis 
Trebouxiophyceae Oocystis 
Chlorophyceae Oogamochlamys 
Prymnesiophyceae Oolithotus 
Xanthophyceae Ophiocytium 
Cyanophyceae Oscillatoria 
Prasinophyceae Ostreococcus 
Dinophyceae Ostreopsis 
Imbricatea Ovaloplaca 
Imbricatea Ovulinata 
Oxyrrhea Oxyrrhis 

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