Hincksella cylindrica
Hincksella cylindrica is an uncommon species, usually found as single stems or colonies consisting of only a few stems.
Hincksella cylindrica is an uncommon species, usually found as single stems or colonies consisting of only a few stems.
Stems fragile, to 4 mm high, proximal part of stem athecate, upper stem with up to 6 hydrothecae, stem internodes wide, cylindrical, curved, smooth, an indistinct slightly oblique node below some hydrothecae.
Hydrothecae subopposite to alternate, cylindrical, adnate adcauline wall convex, free adcauline wall about one quarter length of adnate wall, continuing curve of fused wall, abcauline wall concave; floor of hydrotheca transverse to internode, narrow. Margin circular, rim weakly outrolled.
Perisarc of lower stem thick, thinning markedly on hydrothecae.
Colour: white.
Pacific coast of North America, Caribbean, Southern Australia (New South Wales, Queensland, South Australia, Victoria).
Subtidal.