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

Description:
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.

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

Distribution:
Occasional South Florida, Bahamas and Caribbean.

Cactus tree alga (Caulerpa serrulata)