FIGURE 2 in The Ulva flexuosa complex (Ulvaceae, Chlorophyta): an updated identification key with special reference to the freshwater and hyperhaline taxa

FIGURE 2. Methodology of morphometric measurement. A—single thallus with apical, middle and basal-rhizoidal part (a—length of thallus, b—width of thallus), B–D—single cells (c—length of cell, d—width of cell, e—diameter of pyrenoid, f—width of cell wall), E– H—shape of chromatophores (E—flat chromatophore, F—cup-shaped chromatophore with equal edges ["U"—shaped], G—cup-shaped chromatophore with uneven edges, H—star-shaped chromatophore), I—regular pattern of cells in the thallus (in the form of short parallel rows), J—irregular pattern of the cells, K—cell arrangement around the enlarged basal cell of monoseriate branch, L—monoseriate branch, made up of 7 cells (with circular basal cell and rounded apical cell on the top of the branch), M–R—different shapes of apical cells (M—slightly rounded cell, N—conical cell, O—rounded cell with thin cell wall on the front and coarse sides, P—rounded cell with equal cell walls, R—elongated cell with a thin cell wall on the front and thicker side walls.