Greylist
Species regarded as toxic in the past and later removed from the reference list of toxic species because there is doubt whether they really produce toxins (no new evidence or confirmation for its toxicity) or because the species identity is not clear:
- Alexandrium balechii (Steidinger) Balech, 1995
- Anathece stratus (Komárek & Cronberg) Komárek, Kastovsky & Jezberová, 2011
- Aphanothece paralleliformis Cronberg, 2003
- Aureococcus anophagefferens Hargraves & Sieburth, 1988
- Aureoumbra lagunensis D.A.Stockwell, DeYoe, Hargraves & P.W.Johnson, 1997
- Chattonella malayana W.M.Lum, H.C.Lim, S.T.Teng, K.Takahashi, Leaw, P.T. Lim & Iwataki, 2022
- Cyanobacterium cedrorum (Sauvageau) Komárek, Kopecký & Cepák, 1999
- Halamphora coffeaeformis (C.Agardh) Levkov, 2009
- Luciella masanensis P.L.Mason, Jeong, Litaker, Reece & Steidinger, 2007
- Microcystis panniformis Komárek, Komárková-Legnerová, Sant'Anna, Azevedo & Senna, 2002
- Microcystis pseudofilamentosa W.B. Crow, 1923
- Microcystis ramosa Bharadwaya, 1935
- Phalacroma rotundatum (Claparéde & Lachmann) Kofoid & J.R.Michener, 1911
- Potamolinea aerugineo-caerulea (Gomont) M.D.Martins & L.H.Z.Branco, 2016
- Prorocentrum cassubicum (Woloszynska) J.D.Dodge, 1975
- Prorocentrum emarginatum Y.Fukuyo, 1981
- Prorocentrum micans Ehrenberg, 1833
- Pseudocochlodinium profundisulcus Zhangxi Hu, N.Xu, H.Gu, M.Iwataki, T.Takahashi, Y.Z.Tang & K.Matsuoka, 2021
- Takayama acrotrocha (J.Larsen) Salas, Bolch & Hallegraeff, 2003
- Takayama cladochroma (J.Larsen) M.F.Salas, Bolch & Hallegraeff, 2003