|Kützing ex Bornet & Flahault|
Tolypothrix forms falsely branched, blue-green to brown, single-row threads with a diameter of 6 to 20 µm. Like all bacterial cells , their cylindrical cells contain neither nuclei nor plastids . Each thread sits in its own gelatinous sheath. A fake side branch is created by fragmenting a thread at a pre-formed point where a single cell dies. This creates two separate threads that remain connected by the gelatinous sheath. One of the threads breaks out of the gelatinous sheath, the other thread differentiates one or more colorless, thick-walled cells, the so-called heterocysts, at the branching point . They are used for biological nitrogen fixation . The growth occurs through cell division within the thread.
Sexual reproduction is absent in all cyanobacteria.
Tolypothrix lives on aquatic plants and on stones at the bottom of standing and flowing water. Some species survive the occasional dry run of their waters.
- Tolypothrix distorta
- Tolypothrix lanata
- Tolypothrix penicillata
- Tolypothrix tenius
- Tolypothrix willei
- Karl-Heinz Linne von Berg, Michael Melkonian u. a .: The Kosmos algae guide. The most important freshwater algae under the microscope. Kosmos, Stuttgart 2004, ISBN 3-440-09719-6 .