Rhodophyceae are red algae found majorly in the marine environment with a small percentage of freshwater species.
Asexual reproduction occurs through non-motile spores like monospore, tetraspore, etc.
Sexual reproduction is an advanced oogamous type where the male gamete, the spermatium is non-motile. It reaches the female reproductive structure the carpogonium and reaches the egg or the oogonium through a structure called the trichogyne.
Fertilization is facilitated by water currents as none of the gametes are motile. The post-fertilization changes in Rhodophyceae are complex giving rise to triphasic life cycles.