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| Hantzschia amphioxys var. densestriata (Fontell) Cleve-Euler 1952 |
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| Surirella robusta var. constricta (Fontell) Cleve-Euler 1952 |
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| Gyrosigma tenuirostrum (Grunow in Cleve & Grunow) Cleve-Euler 1952 |
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| Epithemia zebra f. amphicephala (Grunow in Van Heurck) Cleve-Euler 1952 |
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| Nitzschia longissima f. parva (Grunow in Van Heurck) Cleve-Euler 1952 |
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| Nitzschia vermicularis f. minor (Grunow in Van Heurck) Cleve-Euler 1952 |
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| Navicula cuspidata f. danaica (Grunow Ms., Cleve) Cleve-Euler 1952 |
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| Amphiprora hyperborea var. minuta (Grunow) Cleve-Euler 1952 |
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| Gyrosigma spencerii var. smithii (Grunow) Cleve-Euler 1952 |
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| Hantzschia amphioxys var. dubravicensis (Grunow) Cleve-Euler 1952 |
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| Nitzschia fonticola var. romana (Grunow) Cleve-Euler 1952 |
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| Nitzschia punctata var. constricta (Grunow) Cleve-Euler 1952 |
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| Nitzschia subcohaerens (Grunow) Cleve-Euler 1952 |
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| Nitzschia tehermalis f. parva (Grunow) Cleve-Euler 1952 |
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| Nitzschia vivax var. fluminensis (Grunow) Cleve-Euler 1952 |
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| Pleurosigma normanii var. affine (Grunow) Cleve-Euler 1952 |
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| Pleurosigma strigosum var. finmarchicum (Grunow) Cleve-Euler 1952 |
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| Rhopalodia gibba var. genuina (Grunow) Cleve-Euler 1952 |
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| Rhopalodia gibberula var. producta (Grunow) Cleve-Euler 1952 |
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| Surirella scanica (Halden) Cleve-Euler 1952 |
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