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| Navicula divergens var. laticeps Frenguelli 1926 |
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| Navicula divergens f. major Frenguelli 1926 |
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| Navicula divergens f. minor Frenguelli 1926 |
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| Navicula doeringii var. undulata Frenguelli 1926 |
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| Navicula formosa var. cuneata Frenguelli 1926 |
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| Navicula magellanica var. minor Frenguelli 1926 |
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| Navicula major f. abnormis Frenguelli 1926 |
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| Navicula major f. minor Frenguelli 1926 |
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| Navicula major var. perlonga Frenguelli 1926 |
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| Navicula pampeana Frenguelli 1926 |
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| Navicula pampeana var. major Frenguelli 1926 |
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| Navicula pampeana var. minor Frenguelli 1926 |
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| Navicula peregrina f. fossilis (Héribaud) Frenguelli 1926 |
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| Navicula polygramma f. elliptica Frenguelli 1926 |
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| Navicula polygramma f. lanceolata Frenguelli 1926 |
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| Navicula sculpta var. apiculata Frenguelli 1926 |
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| Navicula sculpta var. minima Frenguelli 1926 |
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| Navicula sculpta var. ornata Frenguelli 1926 |
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| Navicula subovalis var. major Frenguelli 1926 |
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| Navicula subovalis var. minor Frenguelli 1926 |
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