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| Caloneis bacillum var. fasciata (Cleve) Mayer 1939 |
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| Caloneis bacillum f. fasciata (Cleve) Mayer 1939 |
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| Caloneis bacillum f. fonticola (Grunow) Mayer 1939 |
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| Caloneis diversistriata Mayer 1939 |
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| Caloneis silicula var. gibba Mayer 1939 |
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| Cymbella cuspidata var. lanceolata Mayer 1939 |
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| Cymbella cuspidata var. rostrata (Rabenhorst) Mayer 1939 |
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| Cymbella heteropleura var. minor Mayer 1939 |
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| Encyonema ventricosum f. lunula (Hilse) Mayer 1939 |
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| Gomphonema angustatum f. productum (Grunow) Mayer 1939 |
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| Gomphonema angustatum f. productum (Grunow) Mayer 1939 |
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| Melosira italica var. muzzanensis (Meister) Mayer 1939 |
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| Meridion circulare var. ("lusus") zinckeni (Kützing) Mayer 1939 |
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| Navicula bacilliformis var. nuda Mayer 1939 |
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| Neidium affine (affinis) f. subrostrata Mayer 1939 |
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| Pinnularia brevicostata var. leptostauron sensu Mayer 1939 |
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| Pinnularia flexuosa X viridis Mayer 1939 |
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| Pinnularia hemileptogongyla Mayer 1939 |
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| Pinnularia hemistreptoraphe Mayer 1939 |
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| Pinnularia leptogongyla sensu Mayer 1939 |
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| Pinnularia leptogongyla f. cruciata Mayer 1939 |
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| Pinnularia leptogongyla var. cruciata Mayer 1939 |
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| Pinnularia leptogongyla var. linearis Mayer 1939 |
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| Pinnularia leptogongyla X macilenta Mayer 1939 |
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| Pinnularia leptogongyla X transversa Mayer 1939 |
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| Pinnularia leptosoma f. elangensis Mayer 1939 |
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| Pinnularia leptosoma var. subinflata Mayer 1939 |
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| Pinnularia major (maior) X flexuosa Mayer 1939 |
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| Pinnularia major (maior) X leptogongyla Mayer 1939 |
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| Pinnularia major (maior) X viridis A Mayer 1939 |
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| Pinnularia major (maior) X viridis B Mayer 1939 |
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| Pinnularia microstauron f. minuta Mayer 1939 |
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| Pinnularia pseudoleptogongyla Mayer 1939 |
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| Pinnularia reinschiana Mayer 1939 |
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| Pinnularia semidistingenda Mayer 1939 |
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| Pinnularia semiflexuosa Mayer 1939 |
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| Pinnularia semimaior (semimajor) Mayer 1939 |
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| Pinnularia semitransversa Mayer 1939 |
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| Pinnularia semiviridis Mayer 1939 |
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| Pinnularia stomatophoroides Mayer 1939 |
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| Pinnularia stomatophoroides var. erlangensis Mayer 1939 |
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| Pinnularia streptoraphe X distinguenda Mayer 1939 |
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| Pinnularia streptoraphe X macilenta Mayer 1939 |
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| Pinnularia streptoraphe X transversa Mayer 1939 |
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| Pinnularia transversa (Schmidt in Schmidt et al.) Mayer 1939 |
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| Pinnularia transversa var. linearis Mayer 1939 |
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| Pinnularia transversa var. nobiliformis Mayer 1939 |
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| Pinnularia viridicreata Mayer 1939 |
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| Pinnularia viridis f. constricta Mayer 1939 |
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| Pinnularia viridis f. cruciata Mayer 1939 |
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| Pinnularia viridis var. cuneata (Østrup) Mayer 1939 |
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| Pinnularia viridis var. fallax sensu Mayer 1939 |
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| Pinnularia viridis f. interrupta Mayer 1939 |
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| Pinnularia viridis var. linearis Mayer 1939 |
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| Pinnularia viridis var. sudetica (Hilse) Mayer 1939 |
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| Stauroneis crumenifera Mayer 1939 |
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| Stauroneis franconica Mayer 1939 |
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| Surirella robusta f. maxima Mayer 1939 |
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| Synedra parasitica var. rhomboidalis Mayer 1939 |
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| Synedra ulna var. joursacensis (Heribaud) Mayer 1939 |
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