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| Achnanthes hungarica var. miramaris Frenguelli 1925 |
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| Achnanthes rivularia Frenguelli 1925 |
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| Amphora miramaris Frenguelli 1925 |
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| Amphora veneta var. minor Frenguelli 1925 |
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| Cymbella cymbiformis f. minor Frenguelli 1925 |
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| Epithemia musculus var. perlonga (Pantocsek) Frenguelli 1925 |
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| Gomphonema constrictum f. parva (Grunow ex Fricke in Schmidt et al.) Frenguelli 1925 |
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| Gomphonema subclavatum var. bonaerensis (bonaerense) Frenguelli 1925 |
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| Navicula borealis f. minor Frenguelli 1925 |
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| Navicula brevis var. distoma (Grunow) Frenguelli 1925 |
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| Navicula capitulata Frenguelli 1925 |
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| Navicula fasciata var. miramaris Frenguelli 1925 |
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| Navicula formosa var. intermedia (Frenguelli) Frenguelli 1925 |
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| Navicula hungarica f. ovalis Frenguelli 1925 |
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| Navicula microstauron f. stauroneiformis (Peragallo) Frenguelli 1925 |
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| Navicula miramaris Frenguelli 1925 |
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| Navicula subovalis var. argentina (Frenguelli) Frenguelli 1925 |
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| Nitzschia oxyrhynchus Frenguelli 1925 |
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| Nitzschia virgata var. capitellata (Hustedt) Frenguelli 1925 |
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| Rhopalodia musculus var. perlonga (Pantocsek) Frenguelli 1925 |
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