FIGURE 6 in Revision of herbarium specimens of freshwater Enteromorpha-like Ulva (Ulvaceae, Chlorophyta) collected from Central Europe during the years 1849-1959

FIGURE 6. Ulva flexuosa subsp. pilifera (Kützing) M.J. Wynne (Voucher code: ZH0001). A—Curly-bubbled thallus in a characteristic cluster from the herbarium sheet (arrow), B—mineral crystals of CaCO 3 on the thallus surface (arrows), C—irregular arrangement of cells in thallus, D—cells with 4–5 walls, view from central part of thalli, E—single pyrenoids in cells (arrows).