FIGURE 13 in Revision of herbarium specimens of freshwater Enteromorpha-like Ulva (Ulvaceae, Chlorophyta) collected from Central Europe during the years 1849-1959

FIGURE 13. Ulva flexuosa subsp. pilifera (Kützing) M.J. Wynne (Voucher code: ZH0007). A—Curly bubbled thalli with macroscopic branching (arrows), B—surface of a thallus with crystals of calcium carbonate (arrow), C—part of the thallus with a visible single layer of cells (arrows), D—initial cells of the branch, surrounded by neighbouring cells (arrows), E—crystals of CaCO 3 (arrow), F—cells with 1–2 pyrenoids (arrows), G—thick cells with cup-shaped chromatophores (arrow).