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| Diploneis domblittensis var. incisa Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Diploneis elliptica var. linearis Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Diploneis ovalis var. beta Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Gyrosigma spenceri (spencerii) f. arnottii Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Mastogloia lacustris var. capitata Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula fennoscandica Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula fortis f. minor Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula gastrum var. romotestriata (remote-striata) Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula hungarica var. elegans Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula rhynchocephala (rhyncocephala) var. antiqua Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula toulaae (toulae) var. apiculata Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula tuscula var. densepunctata (dense-punctata) Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Neidium dubium var. perforata Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Surirella rhombica Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Surirella (Suriraya) bifida Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Surirella (Suriraya) biseriata var. bicuspidata Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Synedra ulna f. joursacensis Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Epithemia cistula var. undulata Cleve-Euler in Backmann & Cleve-Euler 1922 |
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| Cocconeis disculus var. minor Fontell in Backman & Cleve-Euler 1922 |
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| Navicula cuspidata f. parallela L.W. Bailey 1922 |
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