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| Achnanthes lanceolata var. minutissima Krasske 1938 |
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| Amphora dusenii f. simplex Krasske 1938 |
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| Amphora obscura Krasske 1938 |
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| Caloneis bacillum var. jonssoni (Østrup) Krasske 1938 |
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| Caloneis silicula f. arctica Krasske 1938 |
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| Cocconeis brevicostata var. obscura Krasske 1938 |
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| Cymbella obscura Krasske 1938 |
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| Eunotia praerupta var. excelsa Krasske 1938 |
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| Fragilaria brevistriata var. constricta Krasske 1938 |
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| Fragilaria lapponica var. rostrata Krasske 1938 |
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| Gomphonema angustatum var. lagerheimii (Cleve) Krasske 1938 |
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| Gomphonema angustatum var. obtusata (Kützing) Cleve 1938 |
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| Navicula adversa Krasske 1938 |
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| Navicula aliena Krasske 1938 |
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| Navicula crucicula f. arctica Krasske 1938 |
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| Navicula digitoradiata Krasske 1938 |
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| Navicula gandrupi (gandrupii) (Boye Petersen) Krasske 1938 |
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| Navicula gandrupi (gandrupii) var. simplex Krasske 1938 |
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| Navicula gastrum f. minor Krasske 1938 |
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| Navicula gebhardi (gebhardii) Krasske 1938 |
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