Class Genus Species No. Strain No.
Trebouxiophyceae Nannochloris 
Eustigmatophyceae Nannochloropsis 
Bacillariophyceae Navicula 
Florideophyceae Nemalionopsis  43 
Sarcomonadea Neoheteromita 
Nephroselmidophyceae Nephroselmis  20 
Charophyceae Netrium 
Charophyceae Nitella  10  24 
Charophyceae Nitellopsis 
Bacillariophyceae Nitzschia  17 
Cyanophyceae Nodularia 
Chlorarachniophyceae Norrisiella 
Cyanophyceae Nostoc  19 

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