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| Mastogloia lacustris var. capitata Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Melosira italica var. ambigua (Grunow in Van Heurck) A. Cleve-Euler in Backmann & Cleve-Euler 1922 |
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| Navicula arata sensu Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula arenicola sensu Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula carinata (Schumann) Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula cuspidata f. parallela L.W. Bailey 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. exigua sensu 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 meniscus var. menisculus (Schumann) 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 rhynchocephala (rhyncocephala) var. rostellata sensu Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula scutum sensu Cleve-Euler in Backman & Cleve-Euler 1922 |
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| Navicula stroesei (Østrup) 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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| Neidium obliquestriatum sensu Cleve-Euler in Backman & Cleve-Euler 1922 |
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