Plate 3 + 4. Species from the Euastrum oblongum - Micrasterias thomasiana assemblage, characteristic of shallow, mesotrophic, slightly acidic water bodies.

Drawings @ Peter Coesel (Desmids of the Lowlands)

Plate 3 — 1. Penium spirostriolatum; 2. Tetmemorus granulatus; 3. Xanthidium cristatum; 4. Staurodesmus convergens; 5. Euastrum oblongum;

Plate 4 — 6. Closterium lunula; 7. Gonatozygon brebissonii; 8. Micrasterias thomasiana; 9. Cosmarium margaritiferum; 10. Staurastrum spongiosum.