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| Cymbella obtusa var. naviculacea (Grunow in Cleve) Cleve-Euler 1955 |
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| Cymbella caespitosa var. ovata (Grunow in Schmidt et al.) Cleve-Euler 1955 |
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| Pinnularia brebissonii var. mormonorum (Grunow in Schmidt et al.) Cleve-Euler 1955 |
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| Pinnularia sudetica var. commutata (Grunow in Schmidt et al.) Cleve-Euler 1955 |
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| Caloneis bacillum var. inconstantissima (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Caloneis formosa var. liburnica (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Cymbella florentina (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Cymbella leptoceros (leptoceras) f. curta (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Cymbella microcephala f. major (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Pinnularia legumen var. decrescens (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Pinnularia parva (parvula) var. brevistriata (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Pinnularia tenuis var. sublinearis (Grunow in Van Heurck) Cleve-Euler 1955 |
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| Cymbella leptoceros (leptoceras) f. angusta (Grunow) Cleve-Euler 1955 |
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| Gomphonema lanceolatum f. tergestina (Grunow) Cleve-Euler 1955 |
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| Navicula dubia var. peisonis (Grunow) Cleve-Euler 1955 |
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| Pinnularia sudetica var. rupestris (Hantzsch in Rabenhorst) Cleve-Euler 1955 |
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| Gomphonema exiguum var. hyalinum (Heiberg) Cleve-Euler 1955 |
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| Pinnularia hemiptera var. bielawskii (Heribaud & M. Peragallo in Heribaud) Cleve-Euler 1955 |
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| Cymbella gracilis var. girodii (Heribaud) Cleve-Euler 1955 |
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| Cymbella ventricosa var. minuta (Hilse in Rabenhorst) Cleve-Euler 1955 |
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