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| Nitzschia adriatica var. spathulifera Grunow in Cleve & Grunow 1880 |
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| Nitzschia affinis var. upolensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphibia var. acutiuscula Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphibia var. fossilis Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphicephala Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphiprora Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. borealis Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. kariana Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. occidentalis Grunow in Cleve & Grunow 1880 |
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| Nitzschia angustata (angusta) Grunow in Cleve & Grunow 1880 |
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| Nitzschia angustata (angusta) var. acuta Grunow in Cleve & Grunow 1880 |
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| Nitzschia balatonis Grunow in Cleve & Grunow 1880 |
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| Nitzschia bicuneata Grunow in Cleve & Grunow 1880 |
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| Nitzschia bilobata var. lesinensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia brevistriata Grunow in Cleve & Grunow 1880 |
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| Nitzschia communis var. abbreviata Grunow in Cleve & Grunow 1880 |
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| Nitzschia communis var. obtusa Grunow in Cleve & Grunow 1880 |
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| Nitzschia commutata Grunow in Cleve & Grunow 1880 |
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| Nitzschia constricta var. bombiformis Grunow in Cleve & Grunow 1880 |
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| Nitzschia constricta var. genuina Grunow in Cleve & Grunow 1880 |
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