Analipus japonicus

Thallus composed of basal (perennial) rhizomatous crust and main (annual) erect axes. Erect axes cylindrical, compressed, greenish-brown to dark olive-brown, (5)-10-30(-40) cm high, 1-4 mm wide. Branching dense, from all sides. Lateral branches cylindrical to flattened, short and long, 5-10 cm long, slightly swollen above and sometimes curved. Main axes and branches hollow when adult. The hollow surrounded by colorless longitudinally elongated cylindrical cells. Cortex composed of shorter colorless cells (of almost equal diameters) surrounded by dense layer of assimilative branches consisting of 2-7 rows of long cells. Plurangial sporangia cylindrical, of two rows. Growing on rocky, stony bottom, intertidal to upper subtidal (to 2 m depth), in sheltered and moderately exposed shores.

Arctic to temperate latitudes of Pacific Ocean. Common in countries of the Asia-Pacific Region: Russia, Japan, Korea.