Sykidiacaeae family accepted

Cyclocrinales order accepted

Aegagropilopsis Boed. genus doubtful

Ignatiaceae family accepted

Symbiochlorum S.Q.Gong & Z.Y.Li, 2018 genus doubtful

Oltmannsiellopsidales order accepted

Bryopsidales order accepted

Trentepohliales order accepted

Ulvales order accepted

Pseudotrinocladus O.N.Dragastan, 1978 genus doubtful

Ulotrichales order accepted

Cladophorales order accepted

Codiolales order accepted

Dasycladales order accepted

Siphonocladales order accepted

Desmochloris S.Watanabe, N.Kuroda & F.Maiwa, 2001 genus accepted

Bolbocoleon E.G.Pringsh. genus doubtful

Ulothrichopsis Wichmann genus accepted

Siphonales order synonym

Scotinosphaerales order accepted