Fig. 2
Polysiphonia morrowii. Habitat and vegetative morphology. a General view of an intertidal population; b specimens inhabiting the intertidal pools between Crassotrea gigas individuals; c general aspect of an epiphytized thallus; arrowheads denote clumps of sediment; d branching pattern; arrowheads denote fascicles; e detail of branching, denoting the spiral pattern and the frequency of branches; f prostrate axes showing central and pericentral cells; g erect axes showing central and pericentral cells; h cross section of erect axes showing the central cell (white arrowhead) surrounded by four pericentral cells (black arrowhead); i detail of a segment presenting the spiral arrangement of pericentral cells, C chloroplasts; j corymbose growing apices; k detail of rounded apical cells at growing apices; l detail of a spinose apical cell at determinate branches. Scale bars a = 30 cm; b = 4 cm; c and d = 1 cm; e = 125 μm; f, g and i = 100 μm; h and j = 50 μm; k and l = 25 μm