Jania pumila

Thallus bushy, very small, erect or partially prostrate, forming small tufts, to 1 cm diam., of several (8–10) erect branches arising from disc, pinkish-red or whitish-pink. Branching ichotomously (a few dichotomies). Segments subcylindrical, (60–)80–150 μm diam., calcified, short, 2–3 diameters long. Joints flexible, uncalcified, at regular intervals between segments. Conceptacles 230–325 wide, 300–465 μm long. Tetrasporangial conceptacles triangular with two horn-like segments and apical pore. Tetrasporangia elongated oval, zonately divided. Carposporangial conceptacles obovate. Attachment by small roundish disk-like holdfast, to 400 μm diam. Growing commonly epiphytic on Turbinaria ornata, Sargassum spp., Hydroclathrus clathratus, was also found on small shells.

Tropical and subtropical waters of Atlantic, Indian and Pacific Oceans.