Dodatak:Popis zelenih alga, O
Oc uredi
- Ochlochaete Thwaites, 1849
- Octogoniella Pascher, 1930
- Octosporiella Kugrens, 1984
Oe uredi
- Oedocladium E.Stahl, 1891
- Oedogoniaceae de Bary ex Hirn, 1900
- Oedogoniales
- Oedogonium Link ex Hirn, 1900
Ok uredi
- Okellya Leliaert & Rueness, 2009
- Okellyaceae Leliaert & Rueness in Leliaert, F., Rueness, J, Boedeker, C., Maggs, C.A., Cocquyt, E., Verbruggen, H. & De Clerck, O., 2009
Ol uredi
- Olafsenia V.B.A.Trevisan de Saint-Léon
- Oligoporella Pia
- Ollaria V.P.Maslov
- Oltmannsiella Zimmermann, 1930
- Oltmannsiellopsidaceae T.Nakayama, S.Watanabe & I.Inouye, 1996
- Oltmannsiellopsidales
- Oltmannsiellopsis M.Chihara & I.Inouye, 1986
On uredi
- Oncosaccus C.-C.Jao, 1947
Oo uredi
- Oocystaceae Bohlin, 1901
- Oocystaenium Gonzalves & Mehra, 1959
- Oocystales
- Oocystella Lemmermann, 1903
- Oocystidium Korshikov, 1953
- Oocystis Nägeli ex A.Braun, 1855
- Oocystopsis H.Heynig, 1991
Oogamochlamys T.Pröschold, B.Marin, U.W.Schlösser & M.Melkonian uredi
- Oogamochlamys ettlii T.Pröschold, B.Marin, U.W.Schlösser & M.Melkonian
- Oogamochlamys gigantea (Dill) T.Pröschold, B.Marin, U.W.Schlösser & M.Melkonian
- Oogamochlamys zimbabwiensis (J.W.Heimke & R.C.Starr) T.Pröschold, B.Marin, U.W.Schlösser & M.Melkonian
Chlorophyta → Chlorophyceae → Chlamydomonadales → Chlamydomonadaceae[1]
- Oonephris Fott, 1964
- Oophila F.D.Lambert ex N.Wille, 1909
- Ooplanctella Pazoutova, Skaloud & Nemjova, 2010
Or uredi
- Ortonella E.J.Garwood, 1914
Os uredi
- Ostreobiaceae
- Ostreobiaceae P.C. Silva, 2007
- Ostreobium Bornet & Flahault, 1889
- Ostreococcus C.Courties & M.-J.Chrétiennot-Dinet, 1995
Ou uredi
- Ourococcus Grobéty, 1909
Ov uredi
- Ovillaria R.Nielsen, 1988