FIGURE 15 in Revision of herbarium specimens of freshwater Enteromorpha-like Ulva (Ulvaceae, Chlorophyta) collected from Central Europe during the years 1849-1959

FIGURE 15. Ulva cf. flexuosa (Voucher code: ZH0009). A—Intestinally undulating thallus from herbarium sheet (arrow), B—smooth surface of thallus, C—irregularly arranged cells in thalli (arrow), D—part of monoseriate branching of thallus (arrows), E—numerous uniseriate proliferations, F—cells with poorly stained pyrenoids (1 – 3 per cell) (arrow), G—rounded initial cells (arrow) of uniseriate branches, H—germination of initial cells (arrow) of new uniseriate branches, I—several cellular proliferations with rounded apical cells (arrow).