The Participation of Filament Anastomosis in the Developmental Cycle of Nostoc muscorum, a Blue-Green Alga

SUMMARY: During the resumption of development in cultures of Nostoc muscorum A, grown in the dark, and then exposed to light, cellular attachment occurs. This process is believed to be prerequisite for the formation of heterocystous filaments. The significance of anastomosis in the developmental cycle of Nostoc is discussed and a tentative scheme for an alternation of sporogenous and heterocystous generations is presented.