Chart Life Cycle of Ulothrix (Asexual)
The cell of filament under favourable conditions produces the zoospores. The zoospores are produced by ordinary cells of the filament whose contents divide into 2, 4, 8 and 16 parts. Zoospores are (i) Macro zoospores which are slightly flattened and have four flagella and (ii) Micro zoospores which are ovoid and have four or two flagella. Each zoospore is uni nucleate and has a chloroplast in broader part of spore and the apical part consists protoplasm and flagella. After liberation the spores swim for some time and come to rest, attach themselves and grow out directly into new filament.