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A new variety of Tabellaria binalis (Ehrenb.) Grun. var. elliptica, is formally described. It differs from the well-known panduriform variety of T. binalis by its mode of colony formation, smaller size, absence of a central constriction, and arrangement of valve spines. Since Ehrenberg's original drawing of Fragilaria (?) binalis cannot be matched with archive material, a neotype slide is designated.
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