Codium yezoense

Thallus spongy, bushy, solitary or in groups, erect, to 30 cm high, dark green. Branching dichotomous, occasionally with lateral branchlets; with acute angles of branching. Branches cylindrical throughout, 4-5(-8) mm, ultimate branches tapering to 2 mm wide. Utricles cylindrical, club-shape, narrow at basal portion, 75-100(-130) μm diam., 400-650 μm long; in the upper portion - widely cylindrical, 200-320 μm diam., 450-800(-1200) μm long. Apices widely rounded, to conical. Utricle wall very thick, lamellate at apex, 40-100 mm. Hairs or hair scars common, 2-4 per utricle, 100-130 mm below apex. Gametangia ovate, spindle-like, 90-140 mm diam., 170-250 mm long, borne 400 mm below apex, 1-4 per utricle. Attachment by disc-like holdfast. Growing on rocky, muddy, muddy-sandy bottom with stones and old shells, in low intertidal, upper subtidal, to 20 m deep.

Note: Antibacterial activity.

The Sea of Japan (Peter the Great Bay, Sakhalin Island, Kurile Islands).