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| Achnanthes brevipes var. biareolata ‘Mereschkowsky’ according to Proschkina-Lavrenko 1950 |
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| Achnanthes dispar var. angustissima (Jasnitzky) Sheshukova in Proschkina-Lavrenko 1950 |
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| Achnanthes lanceolata var. baicalensis (Skvortzow & Meyer) Sheshukova in Proshkina-Lavrenko 1950 |
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| Amphora reinholdii var. parva Poretzky ex Proschkina-Lavrenko 1950 |
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| Anomoeoneis sphaerophora var. jacutica (Kisselev) Zabelina in Proschkina-Lavrenko 1950 |
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| Asterionella gracillima var. zigzagostellata ‘(Elenkin) Wislouch’ according to Proshkina-Lavrenko 1950 |
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| Campylodiscus decorus var. ralfsii (W. Smith) Kisselev in Proshkina-Lavrenko 1950 |
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| Cymbella elongata Poretzky ex Proschkina-Lavrenko 1950 |
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| Cymbella nurnussiensis Poretzky & Proschkina-Lavrenko 1950 |
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| Diatoma elongatum f. actinastoides (Krieger) Proschkina-Lavrenko 1950 |
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| Diatoma elongatum var. capitellatum Poretzky in Proschkina-Lavrenko 1950 |
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| Diatomella balfouriana f. constricta (Krasske in Hustedt) Proschkina-Lavrenko 1950 |
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| Dimeregramma (Dimerogramma) minor (minus) var. scutulum (Hanna) Proschkina-Lavrenko 1950 |
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| Diploneis constantinii (knostantini) Skabichevskii in Proschkina-Lavrenko 1950 |
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| Diploneis konstantini (konstantinii) Skabichevskii in Proschkina-Lavrenko 1950 |
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| Diploneis papula var. crassa (Missuna) Zabelina in Proschkina-Lavrenko 1950 |
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| Diploneis skvortzovii (skvortowii) var. punctata (Skvortzow) Zabelina in Proschkina-Lavrenko 1950 |
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| Diploneis smithii f. baicalensis (Skvortzow) Zabelina in Proschkina-Lavrenko 1950 |
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| Diploneis splendida f. stigmata Zabelina in Proschkina-Lavrenko 1950 |
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| Epithemia turgida f. vertagus (Kützing) Kisselev in Proschkina-Lavrenko 1950 |
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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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| Nitzschia gracilis var. minor Skabichevskii in Proschkina-Lavrenko 1950 |
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| Nitzschia hustedtii Sheshukova in Proschkina-Lavrenko 1950 |
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| Nitzschia marginulata f. minuta (Grunow in Cleve & Grunow) Proschkina-Lavrenko 1950 |
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| Nitzschia telezkoensis Sheshukova (Scheschukova) in Proschkina-Lavrenko 1950 |
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| Opephora marina var. perminuta (Grunow in Van Heurck) Proschkina-Lavrenko 1950 |
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| Opephora martyi var. amphioxys Poretsky in Proschkina-Lavrenko 1950 |
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| Opephora martyi var. polymorpha (Jouravleva) Proschkina-Lavrenko 1950 |
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| Pinnularia gibba f. interrupta (Cleve) Proschkina-Lavrenko 1950 |
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| Pinnularia meister f. armenica Poretzky in Proschkina-Lavrenko 1950 |
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| Pinnularia nodosa var. palibinii Poretsky ex Proschkina-Lavrenko 1950 |
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| Pinnularia quadratarea (quadratacea, quadrataria) f. grunowii (Schulz) Proschkina-Lavrenko 1950 |
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| Plagiogramma pulchellum var. fenestra (fenestrata) (Brun in Brun & Tempère) Proschkina-Lavrenko 1950 |
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| Plagiogramma pulchellum var. robusta (Brun in Brun & Tempère) Proschkina-Lavrenko 1950 |
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| Rhopalodia anasthasiae (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia arcuata (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia arcuata var. minor (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia cleopatrae (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. arcuata (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. incisa (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. mongolica (Østrup) Proschkina-Lavrenko 1950 |
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| Rhopalodia gibberula var. geminata (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibberula var. magna (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia maeotica (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia ornata (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia perinsignis (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia schuettiana (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Stauroneis phoenicenteron var. nobilis (Schumann) Zabelina in Proschkina-Lavrenko 1950 |
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| Surirella lepnewae (lepnevae) Poretzky & Scheschukova in Proschkina-Lavrenko 1950 |
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| Surirella linearis f. obtusa Skvortzow ex Proschkina-Lavrenko 1950 |
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| Surirella ovata var. hankensis Proschkina-Lavrenko 1950 |
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| Surirella ovata var. pseudopinnata (Mayer) Proschkina-Lavrenko 1950 |
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| Surirella pusilla Sheshukova in Proschkina-Lavrenko 1950 |
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| Surirella robusta f. hankensis (Skvortzow) Kisselev in Proschkina-Lavrenko 1950 |
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| Surirella turgida var. skvortzowii (Meyer) Kisselev in Proschkina-Lavrenko 1950 |
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| Surirella (Suriraya) baldjickii (baldjikii) var. vaszaryi (vascharyi) (Pantocsek) Proschkina-Lavrenko 1950 |
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| Surirella (Suriraya) cibrile Ehrenberg ex Proschkina-Lavrenko 1950 |
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| Synedra capitata var. cuneata Poretzky ex Proschkina-Lavrenko 1950 |
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| Synedra capitata var. gracilis Poretzky ex Proschkina-Lavrenko 1950 |
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| Synedra goulardi var. telezkoensis Poretzky ex Proschkina-Lavrenko 1950 |
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| Tabellaria fenestrata var. spiroides Wislouch ex Proschkina-Lavrenko 1950 |
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| Tetracyclus baicalensis Skvortzow ex Proschkina-Lavrenko 1950 |
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