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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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