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| Navicula palpebralis f. solida (Cleve in Cleve & Grunow) Cleve-Euler 1955 |
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| Caloneis trochus var. trinodis (Cleve) Cleve-Euler 1955 |
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| Pinnularia acrosphaeria var. genuina (Cleve) Cleve-Euler 1955 |
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| Pinnularia acrosphaeria var. minor (Cleve) Cleve-Euler 1955 |
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| Pinnularia acuminata f. interrupta (Cleve) Cleve-Euler 1955 |
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| Pinnularia aestuarii var. minor (Cleve) Cleve-Euler 1955 |
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| Pinnularia nodosa var. capitata (Cleve) Cleve-Euler 1955 |
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| Pinnularia nodosa var. genuina (Cleve) Cleve-Euler 1955 |
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| Caloneis zachariasi var. baltica (Cleve-Euler ex Schulz) Cleve-Euler 1955 |
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| Caloneis backmanii f. stauroneiformis (Cleve-Euler in Backman & Cleve-Euler) Cleve-Euler 1955 |
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| Pinnularia crucifera var. elongata (Cleve-Euler in Brander) Cleve-Euler 1955 |
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| Caloneis bacillaris var. kuolensis (Cleve-Euler) Cleve-Euler 1955 |
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| Caloneis bacillaris var. subrectangularis (Cleve-Euler) Cleve-Euler 1955 |
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| Caloneis silicula var. diminuta (Cleve-Euler) Cleve-Euler 1955 |
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| Caloneis subundulata var. furcata (Cleve-Euler) Cleve-Euler 1955 |
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| Cymbella amphioxys f. parallela (Cleve-Euler) Cleve-Euler 1955 |
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| Cymbella angustata var. subwulffii (Cleve-Euler) Cleve-Euler 1955 |
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| Cymbella caespitosum var. recta (Cleve-Euler) Cleve-Euler 1955 |
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| Cymbella cymbiformis f. curvata (Cleve-Euler) Cleve-Euler 1955 |
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| Cymbella cymbiformis f. excisa (Cleve-Euler) Cleve-Euler 1955 |
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