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| Biddulphia arctica var. neapolitana (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. quinquelobatum (Greville) F.W. Mills 1933 |
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| Biddulphia arctica var. robusta (Truan y Luard & Witt) F.W. Mills 1933 |
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| Biddulphia arctica var. samoense (Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. spitzbergensis (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. tetragona (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arcuata (Shadbolt) F.W. Mills 1933 |
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| Biddulphia bipons ‘Ehrenberg’ Mills 1933 |
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| Biddulphia boryana ‘Pantocsek’ Mills 1933 |
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| Biddulphia gibbosa var. crenulata ‘Post.’ according to Mills 1933 |
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| Biddulphia inelegans var. tubulosa (Brun) F.W. Mills 1933 |
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| Biddulphia inversa ‘Mann’ Mills 1933 |
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| Biddulphia juncta var. fossile ‘Pantocsek’ Mills 1933 |
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| Biddulphia juncta f. pentagona ‘Tempère’ Mills 1933 |
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| Biddulphia lunaris ‘Auctorum’ according to Mills 1933 |
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| Biddulphia mediterranensis ‘Grunow’ Mills 1933 |
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| Biddulphia mobiliensis var. nicobarica ‘Grunow in Van Heurck’ according to Mills 1933 |
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| Biddulphia neogradensis (Pantocsek) F.W. Mills 1933 |
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| Navicula major var. conjugata (Turpin) F.W. Mills 1933 |
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| Odontella blanda (Schmidt in Schmidt et al.) F.W. Mills 1933 |
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