| WebNameShort | |
| Navicula mutica subsp. muticopsis (Van Heurck) Frenguelli 1924 |
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| Navicula muticopsis var. lanceolata Frenguelli 1924 |
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| Navicula muticopsis var. linearis Frenguelli 1924 |
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| Navicula peregrina var. perlonga Frenguelli 1924 |
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| Navicula placentula f. minor Frenguelli 1924 |
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| Navicula portomonttana (portomontana) var. fuegiana Frenguelli 1924 |
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| Navicula silicula var. parva Frenguelli 1924 |
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| Navicula silicula var. patagonia (Otto Müller) Frenguelli 1924 |
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| Navicula silicula var. semicruciata Frenguelli 1924 |
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| Navicula smithii var. argentina Frenguelli 1924 |
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| Navicula stauroptera f. gracilis Frenguelli 1924 |
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| Navicula stauroptera f. parva Frenguelli 1924 |
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| Stauroneis abnormis Frenguelli 1924 |
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| Stauroneis boudetii (M. Peragallo) Frenguelli 1924 |
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| Surirella tuberosa var. costata Frenguelli 1924 |
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| Surirella tuberosa f. elongata Frenguelli 1924 |
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| Surirella (Suriraya) apiculata var. panduriformis Frenguelli 1924 |
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| Synedra pulchella var. grunowii (grunovii) Frenguelli 1924 |
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| Vanheurckia interposita var. incomperta (Lewis) Frenguelli 1924 |
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