10-168 BIOLOGICAL EXAMINATION (10000) ALGAE COLOR PLATES Plate 28. Taste and odor algae. AQUATIC ORGANISMS (10900)/Algae Color Plates 10-169 Plate 29. Filter- and screen-clogging algae. 10-170 BIOLOGICAL EXAMINATION (10000) Plate 30. Fresh-water pollution algae. AQUATIC ORGANISMS (10900)/Algae Color Plates 10-171 Plate 31. Clean-water algae. 10-172 BIOLOGICAL EXAMINATION (10000) Plate 32. Plankton and other surface-water algae. AQUATIC ORGANISMS (10900)/Algae Color Plates 10-173 Plate 33. Algae growing on surfaces. 10-174 BIOLOGICAL EXAMINATION (10000) Plate 34. Wastewater-treatment-pond algae. AQUATIC ORGANISMS (10900)/Algae Color Plates 10-175 Plate 35. Estuarine pollution algae.