Monostroma nitidum

Thallus to 7-10(-15) cm high, thin, membranous (11)-20-25(-50) mm thick, soft, lubricous, bright green, yellowish-green, at first saccate later splitting into several blades with crisped margins. In surface view, cells rounded polygonal, (5)-7-11×8-12.5 mm, with one large (2.5 mm diam.) pyrenoid per cell. Cells mostly grouped in twos. In transverse section, cells roundish to oval, 5-12 mm wide, 15-20 mm high. Rhizoids thin, long, issuing from the basal portion of thallus. Growing on rocks and stones in the uppermost to middle intertidal zone, mostly in sheltered inlets and coves.

Tropical and subtropical waters of Pacific Ocean (the Yellow Sea, East and South China Seas).