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Cactus tree alga
Caulerpa serrulata
(Forsskål) J. Agardh, 1837

Plants with small blades with serrated edges, which grow upward from long, cylindrical, attached runners. Blades often fork and are occasionally twisted. Blades up to 3 cm in length. Color in shades of light to medium mint green, often with bluish tints.
The plants are coenocytic, i.e., the plant is multinucleate and nonseptate.

Grow in shallow rocky substrates, usually with some sand covering in sheltered environments. Down to 5 m.

Occasional South Florida, Bahamas and Caribbean.

Cactus tree alga (Caulerpa serrulata)