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| Bacillaria paradoxa var. pacifica (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria paradoxa var. tumidula (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria socialis var. australis (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria socialis var. baltica (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria socialis var. kariana (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria socialis var. massiliensis (Grunow in Cleve & Grunow) De Toni 1892 |
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| Bacillaria socialis var. seyschellensis (Grunow in Cleve & Grunow) De Toni 1892 |
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| Nitzschia angularis f. upolensis (Grunow in Cleve & Grunow) De Toni 1892 |
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| Nitzschia angularis var. upolensis (Grunow in Cleve & Grunow) De Toni 1892 |
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| Nitzschia smithii var. marginifera (Grunow in Cleve & Grunow) De Toni 1892 |
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| Cystopleura cistula var. lunaris (Grunow in Pantocsek) De Toni 1892 |
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| Grammatophora parallela var. fossilis (Grunow in Pantocsek) De Toni 1892 |
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| Synedra affinis var. sandvicensis (Grunow in Piccone) De Toni 1892 |
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| Campylodiscus latus var. upolensis (Grunow in Schmidt et al.) De Toni 1892 |
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| Cystopleura gibberula var. protracta (Grunow in Van Heurck) De Toni 1892 |
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| Denticula elegans var. kittoniana (Grunow in Van Heurck) De Toni 1892 |
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| Fragilaria crotonensis var. prolongata (Grunow in Van Heurck) De Toni 1892 |
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| Grammatophora marina var. ovalariensis (ovalauensis) (Grunow in Van Heurck) De Toni 1892 |
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| Grammatophora maxima var. adriatica (Grunow in Van Heurck) De Toni 1892 |
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| Pseudo-eunotia flexuosa var. bicapitata (Grunow in Van Heurck) De Toni 1892 |
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