FIGURES 1–4 in Taxonomic notes on Dutch desmids V (Streptophyta, Desmidiales): new species, new morphological features

FIGURES 1–4: Closterium pronum. Fig. 1: vegetative cell. Fig. 2–4: three successive stages of zygospore formation (Fig. 4: mature zygospore in frontal and apical view). FIGURES 5–8: Closterium pygmaeum. FIGURES 9, 10: Euastrum pseudotuddalense. FIGURES 11, 12: Cosmarium vossenbergense. Scale bar A (50 µm): Figs 1–4. Scale bar B (10 µm): Figs 5–12.