FIGURE 12 in Revision of herbarium specimens of freshwater Enteromorpha-like Ulva (Ulvaceae, Chlorophyta) collected from Central Europe during the years 1849-1959

FIGURE 12. Ulva sp. (Voucher code: ZH0006). A—Intestinally undulating thallus from herbarium sheet (arrow), B and C—mineral incrustation on the surface of thallus (arrows), D—irregularly arranged cells with characteristic initial cells of uniseriate branching (arrows), E—cells with 1–2 pyrenoids (arrows), F—initial cell of a branch with a ring of neighbouring cells (arrow).