5-10cm long may cause swimmers itch, found with other seaweeds. 2-12 cm long. 3-8cm in diameter.
Branches attach whatever they contact.
Looks like green rat's feet. Top is green and fuzzy and bottom is calcified and white. Appears like Caulerpa sertularioides except branches are flat with angled edges giving a square or rectangular appearance. Dead bits of this alga makes up a large portion of Hawaii's beach sand. Segmented usually with midribs.