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| Fragilaria mutabilis f. martyi (Heribaud) Cleve-Euler 1932 |
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| Cymbella ventricosa f. minuta (Hilse in Rabenhorst) Cleve-Euler 1932 |
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| Neidium affine (affinis) f. major triundulata (Hustedt) Cleve-Euler 1932 |
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| Caloneis silicula var. gibberula (Kützing) Cleve-Euler 1932 |
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| Fragilaria rumpens var. familiaris (Kützing) Cleve-Euler 1932 |
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| Gomphonema lanceolatum var. affine (Kützing) Cleve-Euler 1932 |
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| Rhopalodia gibba f. longissima (M. Peragallo & Heribaud in Heribaud) Cleve-Euler 1932 |
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| Gomphonema lanceolatum var. genuinum (Mayer) Cleve-Euler 1932 |
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| Achnanthes minutissima f. gracillima (Meister) Cleve-Euler 1932 |
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| Campylodiscus hibernicus var. sublaevis (Meister) Cleve-Euler 1932 |
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| Rhopalodia ingens var. minor (Meister) Cleve-Euler 1932 |
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| Achnanthes minutissima f. inconspicua (Østrup) Cleve-Euler 1932 |
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| Cymbella austriaca var. subrhomboidea (Østrup) Cleve-Euler 1932 |
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| Diatoma tenue f. subcapitata (Østrup) Cleve-Euler 1932 |
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| Navicula digitoradiata var. elliptica (Østrup) Cleve-Euler 1932 |
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| Navicula digitoradiata var. sublinearis (Østrup) Cleve-Euler 1932 |
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| Pinnularia bicapitata var. minor (Otto Müller) Cleve-Euler 1932 |
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| Pinnularia brebissonii f. biundulata, lata (Otto Müller) Cleve-Euler 1932 |
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| Caloneis schilberszkyi var. gibba (Pantocsek) Cleve-Euler 1932 |
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| Cyclotella operculata var. ocellata (Pantocsek) Cleve-Euler 1932 |
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