De orde Chlorellales H.C.Bold & M.J.Wynne kent 5 families en 2 geslachten incertae sedis.
De families:
| Chlorellaceae Brunnthaler | Eremosphaeraceae Brunnthaler | Oocystaceae Bohlin |
| Ctenocladaceae (Borzì) Borzì | Leptosiraceae (Wille) Gerloff |
Incertea sedis:
| Ankistrodesmopsis F.Lederer & J.Lukavski |
| Picochlorum W.J.Henley, J.L.Hironaka, L.Guillou, M.A.Buchheim, J.A.Buchheim, M.W.Fawley & K.P.Fawley |
