- 1. Sphaerotilus natans, bacteria from putrid water, long chains Lieder_2751d
- 2. Sphaerotilus natans, from putrid water, long chains with sheaths Lieder_3840d
- 3. Sphaerotilus natans, bacteria from putrid water forming chains Lieder_7060d
- 4. Sphaerotilus natans, from putrid water, long chains with sheaths Lieder_Ba190d