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| Navicula pupula var. capitata Hustedt in A. Schmidt 1934 |
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| Navicula quadripartita Hustedt in Schmidt et al. 1934 |
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| Navicula quadriundulata Hustedt in Schmidt et al. 1934 |
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| Navicula radiopunctata Hustedt in Schmidt et al. 1934 |
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| Navicula rara Hustedt 1934 |
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| Navicula recondita Hustedt in Schmidt et al. 1934 |
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| Navicula regressa Hustedt in Schmidt et al. 1934 |
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| Navicula rumaniensis Hustedt in Schmidt et al. 1934 |
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| Navicula schmassmanni (schassmannii, schmassmannii) Hustedt in Schmidt et al. 1934 |
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| Navicula scopulorum var. triundulata Meister ex Hustedt in Schmidt et al. 1934 |
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| Navicula secreta Krasske ex Hustedt in Schmidt et al. 1934 |
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| Navicula spirans Hustedt in Schmidt et al. 1934 |
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| Navicula subcancellata Hustedt in Schmidt et al. 1934 |
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| Navicula subdelicata Hustedt in Schmidt et al. 1934 |
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| Navicula subgastrum Hustedt in Schmidt et al. 1934 |
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| Navicula subhexagona Hustedt in Schmidt et al. 1934 |
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| Navicula suchlandtii Hustedt in Schmidt et al. 1934 |
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| Navicula tantula Hustedt in Schmidt et al. 1934 |
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| Navicula tecta Krasske ex Hustedt in Schmidt et al. 1934 |
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| Navicula vara Hustedt in Schmidt et al. 1934 |
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