Nitella opaca is a species of algae in the family Characeae.
Description Nitella opaca is a dioecious species very similar to Nitella flexilis and difficult to distinguish from it.Guiry, M.D., John, D.M. Rindi, F. and McCarthy, T.K. (ed) 2007 New Survey of Clare Island. Volume 6: The Freshwater and Terrestrial Algae. Royal Irish Academy.
Distribution Nitella opaca has been observed in fresh waters, mostly lakes. Can be found up to 12 m deep. M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 23 May 2018.
Etymology From the Latin adjective , meaning "opaque", "not shining".
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