Hormogonium
（重定向自Hormogonia）
Hormogonia are motile filaments of cells formed by some cyanobacteria in the order Nostocales and Stigonematales. They are formed during asexual reproduction in unicellular, filamentous cyanobacteria some contain heterocysts and akinetes.
Cyanobacteria differentiate into hormogonia when exposed to an environmental stress or when placed in new media.