Species [var. ehrenbergii]: Cell body large, swelled at the center (inner-side straight or slightly convex), 230-(384-416)-880 μm long, 44-(64-84)-170 μm wide, L/W=4-6; cell wall smooth, colorless, bands absent; chloroplasts with 4-7 laminae, with many pyrenoids scattered. [ var. atumidum Grönblad ]: Inner side not convex, (416-508)-560 μm long, (60-69)-72 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977). [ var. podolicum Gutwinski ]: Both ends slightly recurved, 382 μm long, 86 μm wide. (Photomicrographs of the Freshwater Algae, vol.9, 1989). [ var. malinvernianum (De Notaris) Rabenhorst ]: Cell wall lined (10-12 striae/10 μm), brownish in color; 265-520 μm long, 52-75 μm wide, L/W=4-7. [ var. michailovskoense Elenkin ]: Cell wall dotted (ibid., vol.4, 1985).

Similar species -->> C. moniliferum; C. lunula;

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Closterium ehrenbergii Meneghini var. ehrenbergii: Cell body large, swelled at center, tapered at both termini, 150-(176-323)-380 μm long, 15-(20-28)-40 μm wide, L/W= 4-6; cell wall smooth, colorless, with no bands; 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).