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| Nitzschia socialis var. baltica Grunow in Cleve & Grunow 1880 |
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| Nitzschia socialis var. kariana Grunow in Cleve & Grunow 1880 |
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| Nitzschia socialis var. massiliensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia socialis var. seyschellensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia spathulifera Grunow in Cleve & Grunow 1880 |
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| Nitzschia spectabilis var. americana Grunow in Cleve & Grunow 1880 |
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| Nitzschia stoliczkiana Grunow in Cleve & Grunow 1880 |
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| Nitzschia subcostata Grunow in Cleve & Grunow 1880 |
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| Nitzschia subdilatata Grunow in Cleve & Grunow 1880 |
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| Nitzschia subtilis (Kützing) Grunow in Cleve & Grunow 1880 |
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| Nitzschia subtilis var. genuina Grunow in Cleve & Grunow 1880 |
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| Nitzschia subtilis var. paleacea Grunow in Cleve & Grunow 1880 |
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| Nitzschia sulcata Grunow in Cleve & Grunow 1880 |
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| Nitzschia tabellaria (Grunow) Grunow in Cleve & Grunow 1880 |
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| Nitzschia thermalis var. littoralis (littorea) Grunow in Cleve & Grunow 1880 |
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| Nitzschia tongatensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia tryblionella var. ambigua Grunow in Cleve & Grunow 1880 |
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| Nitzschia tryblionella var. genuina Grunow in Cleve & Grunow 1880 |
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| Nitzschia tryblionella var. levidensis (W. Smith) Grunow in Cleve & Grunow 1880 |
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| Nitzschia tryblionella var. maxima Grunow in Cleve & Grunow 1880 |
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