Brown algae
Typical classification
Kingdom:Protista
Division:Heterokontophyta
Class:Phaeophyceae
Orders
Ectocarpales
Dictyotales
Desmerestiales
Fucales
Laminariales (kelps)
etc.

The brown algae are a large group of multicellular algae, including various sorts of seaweed. Their distinctive greenish-brown color comes from the pigment fucoxanthin. Well-known members include kelps and bladder wrack.