Is nostoc a cyanobacteria?

Yes, nostoc is a type of cyanobacteria. Cyanobacteria are photosynthetic bacteria that resemble blue-green algae, and nostoc falls into this category. Although they perform photosynthesis like algae, they are classified as bacteria due to their cellular structure and lack of membrane-bound organelles. Cyanobacteria such as nostoc can form gelatinous mats and thrive in moist environments.