Plate 7 — Species from the Cosmarium holmiense - Cosmarium crenatum assemblage, characteristic of oligo-mesotrophic, slightly acidic to neutral, ephemeral water-filled depressions and marshy substrates.
Plate 8 -- Species from the Closterium aciculare - Staurastrum planctonicum assemblage, characteristic of (slightly) eutrophic, big water bodies.
Drawings @ Peter Coesel (Desmids of the Lowlands)
Plate 7. — 1. Cosmarium speciosum; 2. Cosmarium cyclicum; 3. Cosmarium notabile; 4. Cosmarium anceps; 5. Cosmarium crenatum; 6. Cosmarium caelatum; 7. Cosmarium holmiense; 8. Euastrum subalpinum; 9. Cosmarium basiornatum.
Plate 8. — 1. Staurastrum planctonicum; 2. Closterium aciculare; 3. Cosmarium biretum; 4. Staurastrum chaetoceras; 5. Closterium limneticum; 6. Closterium tortum; 7. Cosmarium laeve.