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| Eucocconeis dorogostaiskyi (Jasnitsky) Scheschukova in Proschkina-Lavrenko 1950 |
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| Eucocconeis poretzskyi var. gracilis (Jasnitsky) Scheschukova in Proschkina-Lavrenko 1950 |
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| Eucocconeis poretzskyi (poretzkii) (Jasnitsky) Scheschukova in Proschkina-Lavrenko 1950 |
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| Eunotia monodon var. hankensis (Skvortzow) Scheschukova in Proschkina-Lavrenko 1950 |
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| Eunotia monodon var. latestriata Jouravleva in Proschkina-Lavrenko 1950 |
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| Fragilaria constricta f. trinodis (Hustedt) Proschkina-Lavrenko 1950 |
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| Fragilaria construens var. subcapitata Poretzky ex Proschkina-Lavrenko 1950 |
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| Fragilaria mediterranea var. aralensis Borszcow (Borsczew) 1950 |
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| Fragilaria pseudomesolepta Poretzky ex Proschkina-Lavrenko 1950 |
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| Fragilaria virescens var. maeotica (Pantocsek) Proschkina-Lavrenko 1950 |
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| Frustulia lewisiana f. linearis (Kisselev) e Zabelina in Proschkina-Lavrenko 1950 |
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| Gomphonema baicalense (baicalensis) (Skvortzow & Meyer) Proschkina-Lavrenko 1950 |
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| Gomphonema eriense f. baicalense (Skvortzow & Meyer) Proschkina-Lavrenko 1950 |
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| Gomphonema eriense f. hastata (Skvortzow & Meyer) Proschkina-Lavrenko 1950 |
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| Gyrosigma balticum var. maeoticum (Pantocsek) Proschkina-Lavrenko 1950 |
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| Gyrosigma fasciola (fasciolum) var. closterioides (Grunow) Proschkina-Lavrenko 1950 |
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| Gyrosigma fasciola (fasciolum) var. prolongatum (W. Smith) Proschkina-Lavrenko 1950 |
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| Neidium affine (affinis) f. media (medium) (Cleve) Proschkina-Lavrenko 1950 |
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| Neidium affine (affinis) var. minus (Cleve) Proschkina-Lavrenko 1950 |
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| Nitzschia fonticola var. baicalensis (Skvortzow) Kisselev in Proschkina-Lavrenko 1950 |
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