Order & Family: 
Filamentous algae; cell division occurs near septum and adds "apical cap" 
(folded structure near the septum) ; cell body cylindrical, laterally straight or wavy or 
swell at one end of the cell body ("capitellate") in some species; 
chloroplasts reticulated with many pyrenoids; 
asexual reproduction by zoospore; sexual reproduction by fertilization by egg and sperm; 
monoecious or dioecious.  
 
Genus: linear filament without branching  
(Illustrations of The Japanese Fresh-water Algae, 1977). 
 
Species: 
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