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Cactus tree alga
Caulerpa cupressoides
(Vahl) C. Agardh, 1817

Trunk-like stalks that divide into thick, heavy, upright branches extend from sand covered runners. The length is variable, from 2-8 cm to 15-25 cm. Branches lined with long rows of short, thick, variously shaped branchlets. May be tall and slender with only a few branches, or short and bushy with numerous branches.
The plants are coenocytic, i.e., the plant is multinucleate and nonseptate.

Grow in shallow, protected sandy areas, often adjacent to back patch and fringing reefs.

South Florida, Bahamas and Caribbean.

Cactus tree alga (Caulerpa cupressoides)