Fig 76. (a) A dense community of freshwater epiphytic diatoms. (b), (c) Epilithon from acid oligotrophic rivers. (d) Epilithon from a eutrophic river. (e) Diatoms (Cocconeis) on the episarc of a hydroid. (f) A diatom (Synedra parasitica) epiphytic on a diatom (Nitzschia sigmoidea).
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