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| Eunotia fallax f. subimpressa Cleve-Euler in Cleve-Euler et al. 1951 |
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| Eunotia grunowi (grunovii) f. subundulata Cleve-Euler in Cleve-Euler et al. 1951 |
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| Eunotia praerupta f. perlonga Cleve-Euler in Cleve-Euler et al. 1951 |
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| Eunotia praeruptamonos (praerupta-monos) f. perlonga Cleve-Euler in Cleve-Euler et al. 1951 |
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| Hemiaulus arcticus var. bornholmiensis Cleve-Euler 1951 |
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| Hemiaulus arcticus var. genuinus Cleve-Euler 1951 |
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| Hemiaulus danosuecicus Cleve-Euler 1951 |
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| Hemiaulus danosuecicus f. compressa Cleve-Euler 1951 |
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| Hemiaulus danosuecicus f. typica Cleve-Euler 1951 |
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| Hemiaulus hostilis var. major (Grunow) Cleve-Euler 1951 |
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| Hemiaulus hostilis var. minuta (Grunow) Cleve-Euler 1951 |
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| Hemiaulus hyperboreus var. genuinus Cleve-Euler 1951 |
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| Hemiaulus hyperboreus var. polaris (Grunow) Cleve-Euler 1951 |
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| Hemiaulus mitra var. genuinus Cleve-Euler 1951 |
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| Hemiaulus pileolus var. genuinus Cleve-Euler 1951 |
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| Hemiaulus pileolus var. juetlandicus (Grunow) Cleve-Euler 1951 |
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| Mastogonia biaculeata Cleve-Euler 1951 |
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| Melosira distans f. clinostriata Cleve-Euler 1951 |
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| Melosira distans f. clinostriata Cleve-Euler 1951 |
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| Melosira distans var. decipiens (Grove in Schmidt et al.) Cleve-Euler 1951 |
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