Mesotaenium is a genus of algae belonging to the family Mesotaeniaceae.

The species of this genus are found in Europe and Northern America.

Species:

• Mesotaenium aplanosporum C.E.Taft
• Mesotaenium berggrenii (Wittrock) Lagerheim
• Mesotaenium caldariorum (Lagerheim) Hansgirg
• Mesotaenium chlamydosporum de Bary
• Mesotaenium degreyi W.B.Turner
• Mesotaenium dodekahedron Geitler
• Mesotaenium endlicherianum Nägeli
• Mesotaenium fusisporum (P.L.Crouan & H.M.Crouan) De Toni
• Mesotaenium hansgirgii Schmidle
• Mesotaenium heimii Bourrelly
• Mesotaenium kramstae Lemmerm.
• Mesotaenium macrococcum (Kützing) J.Roy & Bisset
• Mesotaenium minimum J.A.Cushman
• Mesotaenium mirificum W.Archer
• Mesotaenium neglectum Reinhard
• Mesotaenium nivale Bek
• Mesotaenium obscurum Lagerh.
• Mesotaenium purpureum West & G.S.West
• Mesotaenium pyrenoidosum (P.A.Broady) Petlovany
• Mesotaenium truncatum West & G.S.West
• Mesotaenium turicense Huber-Pestalozzi
• Mesotaenium violascens De Bary

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