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| Navicula rhomboides var. saxonica (Rabenhorst; Rabenhorst) F.W. Mills 1934 |
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| Navicula rhomboides var. viridula (Brebisson Kutzing) F.W. Mills 1934 |
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| Navicula rhomboides var. vitrea (Østrup) F.W. Mills 1934 |
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| Navicula rhynchocephala (rhyncocephala) var. robusta (Rabenhorst) F.W. Mills 1934 |
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| Navicula scopulorum var. craticularia (craticula, craticularis) (Peragallo & Peragallo) F.W. Mills 1934 |
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| Navicula silicula var. alpina (Cleve) F.W. Mills 1934 |
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| Navicula smithii var. chilensis (Hustedt) F.W. Mills 1934 |
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| Navicula smithii var. permagna (Cleve-Euler) F.W. Mills 1934 |
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| Navicula smithii var. recta (M. Peragallo in Peragallo & Peragallo) F.W. Mills 1934 |
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| Navicula smithii var. rhombica (Mereschkowsky) F.W. Mills 1934 |
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| Navicula spectabilis f. moelleriana (Janisch in Schmidt et al.) F.W. Mills 1934 |
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| Navicula sphaerophora f. alpha (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora f. capitata (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora f. curta (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora f. curta (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora var. elliptica (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora f. elongata (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora f. elongata (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora var. guentheri (Otto Müller) F.W. Mills 1934 |
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| Navicula sphaerophora var. intermedia (McCall) F.W. Mills 1934 |
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