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| Neidium borbassii (borbasii, barbassii) (Pantocsek) F.W. Mills 1934 |
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| Neidium dubium var. signata (Pantocsek) F.W. Mills 1934 |
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| Neidium iridis var. minor (Otto Müller) F.W. Mills 1934 |
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| Neidium magellanicum (magellanica) var. candelariae (Frenguelli) F.W. Mills 1934 |
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| Neidium magellanicum (magellanica) var. minor (Frenguelli) F.W. Mills 1934 |
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| Neidium pantocsekii (Meister) F.W. Mills 1934 |
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| Neidium productum var. acuta F. W. Mills 1934 |
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| Neidium tanganyikae (G.S. West) F.W. Mills 1934 |
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| Neidium topia (Pantocsek) F.W. Mills 1934 |
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| Nitzschia amphioxys var. capitata (Pantocsek) F.W. Mills 1934 |
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| Nitzschia amphioxys var. crassa (M. Peragallo in Heribaud et al.) F.W. Mills 1934 |
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| Nitzschia amphioxys var. densistriata (Lauby) F.W. Mills 1934 |
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| Nitzschia amphioxys f. hankensis (Skvortzow) F.W. Mills 1934 |
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| Nitzschia amphioxys var. hispida (M. Peragallo in Heribaud et al.) F.W. Mills 1934 |
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| Nitzschia amphioxys var. royatense (Ostrup in Heribaud et al.) F.W. Mills 1934 |
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| Nitzschia atlantica (Cleve) F.W. Mills 1934 |
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| Nitzschia biplacata (Mereschkowsky) F.W. Mills 1934 |
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| Nitzschia biplacata var. pacifica (Mereschkowsky) F.W. Mills 1934 |
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| Nitzschia communis f. angustior (A. Cleve) F.W. Mills 1934 |
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| Nitzschia crassa (Pantocsek) F.W. Mills 1934 |
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