Chaetomorpha moniligera

Thallus filamentous, soft, caespitose, gregarious, erect or lodged, to 30 cm long, bright-green or pale-green. In the lower part cells cylindrical, slightly swollen, with slight constrictions at joints, 100-130(-350) mm diam., 2-4 diameters long, with thick, striated cell wall, (13)-25-30(-60) mm. Above cells becoming barrel-shaped, to almost spherical in the upper portion, 700-1000(-2000) mm diam., constricted at cell joints, cell wall thin. Basal cell elongated 4-6 diameters long, ending into slightly lobed disc-like holdfast. Growing on stony, muddy-sandy bottom in intertidal to upper subtidal in bays; on rocks in intertidal pools and crevices forming dense tufts.

Note: The alga is a source of natural antioxidants.

The Okhotsk Sea and the Sea of Japan.