Lessoniaceae

, sea oak is a species of kelp, of the brown algae, best known for its use in Japanese cuisine.

genus of algae

Lessoniaceae are a family of kelp. Species of this family have a transition zone with the intercalary meristem subdivided so that there are a number of secondary stipes in addition to the primary stipe.

Egregia menziesii is a species of kelp known commonly as feather boa kelp. It is the only species in the monotypic genus Egregia. It is native to the coastline of western North America from Alaska to Baja California, where it is a common kelp of the intertidal zone.