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| Hantzschia amphioxys var. americana Hustedt in A. Schmit 1922 |
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| Hantzschia amphioxys var. compacta Hustedt in Schmidt et al. 1922 |
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| Hantzschia amphioxys var. obtusa Hustedt in Schmidt et al. 1922 |
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| Hantzschia amphioxys var. stricta Hustedt in Schmidt et al. 1922 |
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| Hantzschia pseudomarina Hustedt in Schmidt et al. 1922 |
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| Hantzschia robusta Hustedt in Schmidt et al. 1922 |
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| Hantzschia virgata var. capitellata Hustedt in Schmidt et al. 1922 |
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| Hantzschia virgata var. gracilis Hustedt in Schmidt et al. 1922 |
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| Nitzschia amphibia var. pelagica Hustedt in Schmidt et al. 1922 |
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| Nitzschia capitellata Hustedt in Schmidt et al. 1922 |
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| Nitzschia curvilineata Hustedt in Schmidt et al. 1922 |
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| Nitzschia frickei Reichelt ex Hustedt in Schmidt et al. 1922 |
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| Nitzschia goetzeana var. gracilior Hustedt in A. Schmidt 1922 |
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| Nitzschia guineensis Hustedt in Schmidt et al. 1922 |
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| Nitzschia lacunarum Hustedt in Schmidt et al. 1922 |
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| Nitzschia lacustris Hustedt in A. Schmidt 1922 |
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| Nitzschia liebethruthii (liebetruthii) var. siamensis Hustedt in Schmidt et al. 1922 |
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| Nitzschia naviculaeformis Hustedt in Schmidt et al. 1922 |
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| Nitzschia pamirensis Hustedt in A. Schmidt 1922 |
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| Nitzschia planctonica Hustedt in Schmidt et al. 1922 |
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