Halimeda incrassata

Thallus bushy, erect, to 20-25 cm high, light green to dark green, initially branching in one plane, polychotomous at the basal part, di-trichotomous above. Segments calcified more heavily at basal portion and moderately in the upper. Basal segments laterally fused in twos, subcylindrical, compressed, oval; above segments trilobate to cuneiform, sometimes ribbed, 2-10 mm wide, 6-10 mm long, 0.5-7.0 mm thick. Margins entire, undulating, deeply cleft. In longitudinal section of segment, utricles mainly obpyramidal, in 3-5 layers: surface utricles 50-60 mm diam., 70-100 mm long; subsurface utricles 40-75 mm diam., 65-100(-125) mm long, each bears 2-4 surface utricles. Holdfast cylindrical composed of thin, branched rhizoids, binding sand particles, dead shells, to 6 cm long. Abundant on sandy bottom among seagrass meadows (1-2 m to 15-30 m deep).

Tropical and subtropical waters of Atlantic, Indian and Pacific Oceans.