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| Navicula divergens var. parallela (Brun) Frenguelli 1924 |
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| Navicula magellanica (Cleve) Frenguelli 1924 |
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| Navicula magellanica (Cleve) Frenguelli 1924 |
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| Navicula minutissima (Cleve) Frenguelli 1924 |
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| Eunotia praerupta var. tridentata (Ehrenberg) Frenguelli 1924 |
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| Gomphonema constrictum var. clavata (Ehrenberg) Frenguelli 1924 |
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| Navicula affinis var. ampliata (Ehrenberg) Frenguelli 1924 |
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| Navicula affinis var. ampliata (Ehrenberg; Ehrenberg) Frenguelli 1924 |
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| Navicula lata var. latestriata (Gregory) Frenguelli 1924 |
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| Fragilaria pinnata var. lapponica (Grunow in Van Heurck) Frenguelli 1924 |
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| Navicula fasciata var. fontinalis (Grunow in Van Heurck) Frenguelli 1924 |
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| Gomphonema olivaceum f. vulgaris (Kützing) Frenguelli 1924 |
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| Navicula mutica (Kützing) Frenguelli 1924 |
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| Vanheurckia interposita var. incomperta (Lewis) Frenguelli 1924 |
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| Navicula mutica subsp. charcotii (M. Peragallo) Frenguelli 1924 |
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| Stauroneis boudetii (M. Peragallo) Frenguelli 1924 |
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| Epithemia gibberula var. vanheurckii (van heurckii) (Otto Müller) Frenguelli 1924 |
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| Navicula linearis (Otto Müller) Frenguelli 1924 |
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| Navicula silicula var. patagonia (Otto Müller) Frenguelli 1924 |
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| Navicula mutica subsp. muticopsis (Van Heurck) Frenguelli 1924 |
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| Epithemia zebra f. minor Frenguelli 1924 |
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| Fragilaria pinnata var. minor Frenguelli 1924 |
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| Fragilaria pinnata var. perlonga Frenguelli 1924 |
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| Gomphonema candelariae Frenguelli 1924 |
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| Gomphonema candelariae var. elliptica Frenguelli 1924 |
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| Gomphonema candelariae var. minor Frenguelli 1924 |
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| Navicula affinis f. minor Frenguelli 1924 |
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| Navicula charcotii var. magellanica Frenguelli 1924 |
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| Navicula cuspidata f. craticula Frenguelli 1924 |
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| Navicula cuspidata var. major Frenguelli 1924 |
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| Navicula expeditionis Frenguelli 1924 |
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| Navicula fuegiana Frenguelli 1924 |
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| Navicula fuegiana var. rostrata Frenguelli 1924 |
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| Navicula iridis var. dubia Frenguelli 1924 |
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| Navicula iridis f. minor Frenguelli 1924 |
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| Navicula laetvittata var. spathulata Frenguelli 1924 |
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| Navicula magellancia var. candelariae Frenguelli 1924 |
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| Navicula magellanica var. candelariae Frenguelli 1924 |
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| Navicula multicopsis var. lanceolata Frenguelli 1924 |
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| Navicula multicopsis var. linearis 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. 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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| 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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| Epithemia zebra var. elongata Grunow ex Frenguelli 1924 |
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| Navicula microstauron var. stauroneiformis Peragallo in Frenguelli 1924 |
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| Navicula cuspidata sensu Frenguelli 1924 |
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| Navicula cuspidata sensu Frenguelli 1924 |
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