| WebNameShort | |
| Nitzschia abludens Grunow 1878 |
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| Nitzschia acuminata (W. Smith) Grunow 1878 |
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| Nitzschia apiculata (Gregory) Grunow 1878 |
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| Nitzschia circumsuta (J.W. Bailey) Grunow 1878 |
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| Nitzschia incurva Grunow 1878 |
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| Nitzschia intercedens Grunow 1878 |
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| Nitzschia maxima Grunow 1878 |
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| Nitzschia punctata (W. Smith) Grunow 1878 |
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| Nitzschia sigma var. abludens Grunow 1878 |
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| Nitzschia sigma var. anguillula (Schumann) Grunow 1878 |
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| Nitzschia sigma var. clausii (Hantzsch) Grunow 1878 |
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| Nitzschia sigma var. consimilis Grunow 1878 |
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| Nitzschia sigma var. fasciculata Grunow 1878 |
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| Nitzschia sigma var. genuina Grunow 1878 |
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| Nitzschia sigma var. intercedens (intersedens) Grunow 1878 |
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| Nitzschia sigma var. maxima Grunow 1878 |
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| Nitzschia sigma var. rigida (Kützing) Grunow 1878 |
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| Nitzschia sigma var. sigmatella Grunow 1878 |
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| Nitzschia sigma var. subrecta (Grunow) Grunow 1878 |
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| Nitzschia sigma var. valida Grunow 1878 |
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