Answer:
sheathed bacteria
Step-by-step explanation:
- Sphaerotilus and Leptothrix are examples of sheathed bacteria that have a filamentous appearance because of which they look like fungus and hence, are also known as sewage fungus.
- They are usually found onto the surface of contaminated waters.
- These are sheathed bacteria as the filament-like appearing sheath bears the single cells of gram-negative bacteria.
- These organisms thrive on organic matter and hence, sewage-contaminated water is a common habitat for them.