anabaena is a genus of filamentous cyanobacteria.

abstract acetylcholine alga algal ammonia anabaena background biology blue chloroplast colonial composition cyanobacteria cyanobacterium cyanophytes detail ecology education environment euphorbiaceae fields filamentous fixing foliage freshwater gas genus green greens growth heterocysts laboratory lake macro microscope microscopic mosquito nature neurotoxin neurotoxins nitrogen paddy plankton plants pond primitive produce rice river science slide structure symbiotic texture water