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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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| 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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| Pinnularia gibba f. interrupta (Cleve) Proschkina-Lavrenko 1950 |
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| Nitzschia marginulata f. minuta (Grunow in Cleve & Grunow) Proschkina-Lavrenko 1950 |
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| Opephora marina var. perminuta (Grunow in Van Heurck) Proschkina-Lavrenko 1950 |
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| Gyrosigma fasciola (fasciolum) var. closterioides (Grunow) Proschkina-Lavrenko 1950 |
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| Dimeregramma (Dimerogramma) minor (minus) var. scutulum (Hanna) Proschkina-Lavrenko 1950 |
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| Fragilaria constricta f. trinodis (Hustedt) 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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| Achnanthes dispar var. angustissima (Jasnitzky) Sheshukova in Proschkina-Lavrenko 1950 |
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| Opephora martyi var. polymorpha (Jouravleva) Proschkina-Lavrenko 1950 |
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| Anomoeoneis sphaerophora var. jacutica (Kisselev) Zabelina in Proschkina-Lavrenko 1950 |
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| Frustulia lewisiana f. linearis (Kisselev) e Zabelina in Proschkina-Lavrenko 1950 |
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| Diatomella balfouriana f. constricta (Krasske in Hustedt) Proschkina-Lavrenko 1950 |
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| Diatoma elongatum f. actinastoides (Krieger) Proschkina-Lavrenko 1950 |
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| Epithemia turgida f. vertagus (Kützing) Kisselev in Proschkina-Lavrenko 1950 |
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