Caulerpa fergusonii
Caulerpa fergusonii is a species of seaweed in the "Caulerpaceae" family. The seaweed is olive green at the base becoming a darker green distally. The thallus spreads outward to about . The species is found around much of Asia and the Pacific Islands as well as Australia and New Zealand. In Western Australia, it is found along the coast in a large area extending from around the Kimberley, south as far as Esperance in the Goldfields-Esperance region of Western Australia.