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| Amphora veneta var. gibbosa Frenguelli 1926 |
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| Anomoeoneis sculpta var. apiculata Frenguelli 1926 |
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| Anomoeoneis sculpta var. minima Frenguelli 1926 |
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| Anomoeoneis sculpta var. ornata Frenguelli 1926 |
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| Campylodiscus clypeus f. minor (Pantocsek) Frenguelli 1926 |
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| Fragilaria construens var. trigibba (Pantocsek) Frenguelli 1926 |
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| Fragilaria peragalli Frenguelli 1926 |
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| Gomphonema berggrenii var. capitata Frenguelli 1926 |
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| Gomphonema cruciferum Frenguelli 1926 |
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| Gomphonema subclavatum var. fossilis Frenguelli 1926 |
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| Hantzschia amphioxys var. exilis Frenguelli 1926 |
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| Hantzschia faba Frenguelli 1926 |
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| Hantzschia limi Frenguelli 1926 |
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| Hantzschia limi var. minor Frenguelli 1926 |
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| Hyalodiscus schmidtii Frenguelli 1926 |
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| Navicula affinis f. minor Frenguelli 1926 |
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| Navicula borealis f. minor (M. Peragallo & Héribaud) Frenguelli 1926 |
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| Navicula brevistriata (Van Heurck) Frenguelli 1926 |
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| Navicula columnaris var. undulata Frenguelli 1926 |
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| Navicula delicata Frenguelli 1926 |
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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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| Nitzschia amphibia var. acuta Frenguelli 1926 |
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| Nitzschia amphioxys var. exilis Frenguelli 1926 |
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| Nitzschia faba Frenguelli 1926 |
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| Nitzschia limi Frenguelli 1926 |
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| Nitzschia limi var. minor Frenguelli 1926 |
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| Novilla fortii Frenguelli 1926 |
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| Sigmatella sigma var. rigida (Kützing) Frenguelli 1926 |
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| Stauroneis acuta var. inflata (Heiden in Schmidt et al.) Frenguelli 1926 |
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| Surirella fortii Frenguelli 1926 |
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