FIGURE 2. Polysiphonia scopulorum Harvey. A in The phylogenetic position of Polysiphonia scopulorum (Rhodomelaceae, Rhodophyta) based on molecular analyses and morphological observations of specimens from the type locality in Western Australia

FIGURE 2. Polysiphonia scopulorum Harvey. A: Tetrasporophyte (Rottnest Island, Australia; 11 November 2015); B & C: Prostrate axes and numerous erect axes; D: Unicellular rhizoid in open connection (arrowhead) with a pericentral cell and apex of prostrate axes (arrow); E: Unicellular rhizoid in open connection (arrowhead) with pericentral cell and erect axes (arrow); F: Irregular branching pattern; G: Scar cells on erect axes; H: Cross-section of erect axes; I: Discoid rhodoplasts in pericentral cells; J: Apical cell (arrowhead) and endogenous branching (arrows) in erect axes; K–M: Apical cell (arrowhead) and exogenous branching (arrows) in erect axes; N: Apex of erect axes (arrowhead: apical cell); O & P: Trichoblast; Q: Adventitious branch (arrowhead); R: Tetrahedrally divided tetrasporangia; S: Tetrasporangia (arrowheads) and trichoblast or scar cells (arrows); T: Cross-section of tetrasporangial branch (arrowheads: pericentral cells, arrows: presporangial cover cells, t: tetrasporangium, cc: central cell); U: Slightly spiral arrangement of tetrasporangial series (Scale bars: A = 5 mm, B, C, F = 500 μm; D, E, H, I, Q, R, S, T = 50 μm; G, P, U = 100 μm; J–M = 20 μm; N = 30 μm; O = 200 μm).