Jania adhaerens

Thallus erect, bushy, forming dense tufts or cushions, (0.5)-1-3.5 cm high, grayish-violet or pinkish-violet. Branching widely dichotomous, often in one plane. Branches cylindrical, 120-150(-180) mm diam., gradually tapering to obtuse apices. Segments heavily calcified, 2-5(-8) diameters long. Joints flexible, non-calcified, at regular intervals between segments. Carposporangial conceptacles obovoid, 200-300 μm in diam., 250-450 μm long. Tetrasporangial conceptacles urn-shaped, 240-300(-500) μm in diam., 300-340(-500) μm long, develop in the upper dichotomies of thallus. Tetrasporangia oval, 60-80×80-100 μm, zonately divided. The conceptacles with a single central pore. Attachment by crustoselike holdfast and secondary lateral holdfasts along decumbent axes. Growing in the middle intertidal to upper subtidal zones on rocks and epiphytic.

In the tropical and subtropical zones of Atlantic, Indian and Pacific Oceans.