Hydrodictyon, although quite different in form and growth habit from Pediastrum, is similar with regard to its life history. The sexual life history is haplontic and isogamous (note d-l for gamete release and zygote formation). The same cells that released gametes can release zoospores (d-p). The meoitic spores (meiospores) function as the zoospore and produce q, a cell that undergoes autocolony formation (also illustrated d-i). There is no vegetative reproduction in this organism.