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| Nitzschia insignis var. genuina Grunow in Cleve & Grunow 1880 |
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| Nitzschia insignis var. marginifera Grunow in Cleve & Grunow 1880 |
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| Nitzschia insignis var. mauritiana Grunow in Cleve & Grunow 1880 |
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| Nitzschia insignis var. notabilis Grunow in Cleve & Grunow 1880 |
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| Nitzschia intermedia Hantzsch ex Cleve & Grunow 1880 |
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| Nitzschia jelineckii var. elongata Grunow in Cleve & Grunow 1880 |
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| Nitzschia jelineckii var. subcostata Grunow in Cleve & Grunow 1880 |
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| Nitzschia kuetzingiana var. exilis Grunow in Cleve & Grunow 1880 |
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| Nitzschia kuetzingiana var. fonticola Grunow in Cleve & Grunow 1880 |
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| Nitzschia kuetzingiana var. perminuta Grunow in Cleve & Grunow 1880 |
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| Nitzschia kuetzingiana var. romana Grunow in Cleve & Grunow 1880 |
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| Nitzschia lamprocampa (lamprocarpa) Hantzsch ex Cleve & Grunow 1880 |
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| Nitzschia lanceola (Grunow in Cleve) Grunow in Cleve & Grunow 1880 |
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| Nitzschia lanceola var. minutula Grunow in Cleve & Grunow 1880 |
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| Nitzschia lanceolata var. incrustans (Grunow) Grunow in Cleve & Grunow 1880 |
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| Nitzschia lesinensis var. diminuta Grunow in Cleve & Grunow 1880 |
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| Nitzschia liebetruthii var. minuscula Grunow in Cleve & Grunow 1880 |
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| Nitzschia linearis var. suecica Grunow in Cleve & Grunow 1880 |
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| Nitzschia linearis var. tenuis (W. Smith) Grunow in Cleve & Grunow 1880 |
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| Nitzschia littoralis Grunow in Cleve & Grunow 1880 |
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