Sphaerotilus natans

Sphaerotilus natans is an aquatic periphyton organism associated with polluted water. It forms colonies commonly known as "sewage fungus", but later identified as tightly sheathed filamentous bacteria.

Sphaerotilus natans
Submerged S. natans colonies with floating insect in the lower right for scale. Beige color shown is typical of aerated sewage treatment plants, but color may vary through grey toward black downstream of septic sewage or into brighter orange from precipitated ferric oxide.
Scientific classification
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Sphaerotilus

Kützing 1833
Species:
S. natans
Binomial name
Sphaerotilus natans
Kützing 1833
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