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Arthrodesmus convergens. 15. Arthrodesmus divergens. 16. Astrionella formosa. 17. Bacteria. 18. Bosmina. 19. Botryiococcus. 20. Branchippus stagnalis. 21. Castor. 22. Centropyxis. 23. Chetochilis. 24. Chilomonads. 25. Chlorococcus. 26. Chydorus. 27. Chytridium. 28. Clatbrocystis aeruginosa. 29. Closterium lunula. 30. " didymotocum. 31. " moniliferum. 32. Coelastrum sphericum. 33.
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