| WebNameShort | |
| Achnanthes exigua var. constricta Hustedt 1921 |
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| Achnanthes subhudsonis Hustedt 1921 |
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| Amphora schroederi Hustedt 1921 |
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| Anomoeoneis serians f. minor Hustedt 1921 |
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| Caloneis aequatorialis Hustedt 1921 |
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| Caloneis aequatorialis var. capitata Hustedt 1921 |
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| Eunotia pectinalis f. incisa Hustedt 1921 |
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| Fragilaria construens var. exigua (W. Smith) Hustedt 1921 |
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| Hantzschia amphioxys var. africana Hustedt 1921 |
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| Hantzschia amphioxys var. distincte-punctata Hustedt 1921 |
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| Navicula kwamkuji Hustedt 1921 |
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| Navicula lagerheimii sensu Hustedt 1921 |
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| Neidium inconspicuum (inconspicua) Hustedt 1921 |
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| Nitzschia goetzeana var. gracilior Hustedt 1921 |
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| Nitzschia lacustris Hustedt 1921 |
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| Pinnularia amaniensis Hustedt 1921 |
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| Pinnularia divergens f. minor Hustedt 1921 |
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| Pinnularia hartleyana f. linearis Hustedt 1921 |
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| Stauroneis scaphulaeformis Hustedt 1921 |
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| Stauroneis scaphulaeformis f. minor Hustedt 1921 |
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