(Hallasia) (Hallasia) is a biological genus in the family Zygnemataceae and order Zygnematales.
Hallasia columbiana
Hallasia decussata
Hallasia desmidioides
Hallasia floridana
Hallasia minuta
Hallasia reticulata
Hallasia spiralis
Hallasia tiffaniana
Cosmocladium
Debarya
Docidium
Euastridium
Hallasia
Mougeotia
Mougeotiopsis
Sirogonium
Spirogyra
Teilingia
Zygnema
Zygogonium