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A new species of the genus Taonia (Dictyotales, Phaeophyta) is described from the Mediterranean Sea. The species is characterized by pseudodichotomous fronds having entire margins and by a pronounced differentiation between the medullary and cortical cells throughout the thallus. Only tetrasporangial plants were found. The species differs from T. atomaria f. ciliata in having differently sized cells in cross section and an entire margin and from T. lennebackerae in both the habit and in the shape of cells in longitudinal section.