Nostoc is a genus of filamentous nitrogen-fixing cyanobacteria that form macroscopic or microscopic colonies and is common in both terrestrial and aquatic environments (Potts, 2002).

Which cyanobacteria can fix atmospheric nitrogen?

Free-living nitrogen-fixers include the cyanobacteria Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.

Are all cyanobacteria are n2 fixers?

Cyanobacteria are oxygenic photosynthetic bacteria that are widespread in marine, freshwater and terrestrial environments, and many of them are capable of fixing atmospheric nitrogen. ... This strategy is known as spatial separation of oxygenic photosynthesis and nitrogen fixation.