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| Neohuttonia tripartita (Barker & Meakin) Desikachary & Sreelatha 1989 |
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| Nitzschia bilobata var. oamaruensis Desikachary & Sreelatha 1989 |
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| Plagiogramma schraderii Desikachary & Sreelatha 1989 |
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| Rattrayella simbirskianus (Grunow in A. Schmidt) Desikachary & Sreelatha 1989 |
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| Rhaphoneis nodulifer f. major Desikachary & Sreelatha 1989 |
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| Stephanopyxis monstrosa (Forti) Desikachary & Sreelatha 1989 |
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| Stictodiscus californicus f. triangularis Desikachary & Sreelatha 1989 |
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| Stictodiscus haitianus var. major Desikachary & Sreelatha 1989 |
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| Stictodiscus parallelus f. pentagona Desikachary & Sreelatha 1989 |
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| Triceratium barkerii Desikachary & Sreelatha 1989 |
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| Triceratium reedii Desikachary & Sreelatha 1989 |
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| Trigonium arcticum var. japonica (Grunow in Schmidt) Desikachary & Sreelatha 1989 |
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| Trigonium arcticum var. pentagonalis (Tempère & Peragallo) Desikachary & Sreelatha 1989 |
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| Trigonium arcticum var. quadrata (Grunow ex Tempère & Peragallo) Desikachary & Sreelatha 1989 |
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| Trigonium formosum f. quadrangularis (Greville) Desikachary & Sreelatha 1989 |
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| Trigonium gallapagense (Cleve) Desikachary & Sreelatha 1989 |
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| Trigonium inelegans var. micropora (Grunow in Van Heurck) Desikachary & Sreelatha 1989 |
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| Trigonium inelegans var. tubulosa (Brun) Desikachary & Sreelatha 1989 |
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| Trigonium lineatum (Greville) Desikachary & Sreelatha 1989 |
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| Trigonium lineatum f. biangulata (Laporte & Lefebure) Desikachary & Sreelatha 1989 |
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