“…They also produce gliding gonidia, form rosettes and have the ability to deposit intracellular sulfur granules (Larkin & Strohl, 1983;Williams & Unz, 1985a, b;Williams et al, 1987). Thiothrix species are found in a number of habitats, ranging from sulfide-containing natural waters (Brigmon et al, 1994a;Jones et al, 1982;McGlannan & Makemson, 1990) and irrigation systems (Ford & Tucker, 1975) to activated-sludge wastewater-treatment plants, where their presence in large numbers contributes to the problem of filamentous sludge bulking (Brigmon et al, 1994b;Eikelboom, 1975;Tandoi et al, 1994;Wagner et al, 1994;Williams & Unz, 1985a).…”