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The Genus Seliberia

Bacteria of the genus Seliberia are recognized by the presence of radial clusters (starlike aggregates) of rod-shaped bacteria, a characteristic screwlike twisting of the rod surface, and the formation of oval or spherical reproductive cells by a budding process-usually at the apical end of rods in a radially arranged aggregate or at a tip of an individual rod (Aristovskaya and Parinkina, 1963; Aristovskaya, 1964). The rods are 0.5-0.7 µm wide and their length varies with the composition of the nutrient medium used (Aristovskaya, 1974). The oval "reproductive" cells, which are found in soil isolates cultivated on appropriate medium, may also occur in the center of the star-shaped aggregates, and these "reproductive" cells have been observed to germinate into rods. A preponderance of oval cells or spherical cells is referred to as the zoogleal stage. The spherical or oval cells of Seliberia stellata, a soil isolate, and several seliberia-like helically sculptured rods