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| Navicula contenta f. biceps (Arnott Ms., Grunow in Van Heurck) Hustedt 1930 |
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| Surirella ovata var. crumena (Brébisson ex Kützing) Hustedt 1930 |
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| Anomoeoneis serians var. brachysira (Brébisson in Rabenhorst) Hustedt 1930 |
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| Eucocconeis flexella var. alpestris (Brun) Hustedt 1930 |
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| Gomphocymbella ancyli (Cleve) Hustedt 1930 |
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| Navicula elegans f. cuspidata (Cleve) Hustedt 1930 |
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| Neidium iridis f. maxima (Cleve) Hustedt 1930 |
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| Pinnularia acrosphaeria f. undulata (Cleve) Hustedt 1930 |
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| Pinnularia mesolepta f. angusta (angustata) (Cleve) Hustedt 1930 |
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| Achnanthes oestrupii (Cleve-Euler) Hustedt 1930 |
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| Stauroneis phoenicenteron f. brevis (Dippel) Hustedt 1930 |
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| Stauroneis phoenicenteron f. gracilis (Dippel) Hustedt 1930 |
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| Amphora ovalis f. gracilis (Ehrenberg) Hustedt 1930 |
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| Eunotia pectinalis f. impressa (Ehrenberg) Hustedt 1930 |
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| Pinnularia gibba var. mesogongyla (Ehrenberg) Hustedt 1930 |
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| Pinnularia gibba var. parva (Ehrenberg) Hustedt 1930 |
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| Stauroneis anceps f. gracilis (Ehrenberg) Hustedt 1930 |
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| Stauroneis anceps f. linearis (Ehrenberg) Hustedt 1930 |
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| Diatoma vulgare var. ovalis (Fricke in Schmidt et al.) Hustedt 1930 |
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| Gomphonema helveticum var. tenuis (Fricke in Schmidt et al.) Hustedt 1930 |
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| Navicula placentula f. jenisseyensis (Grunow in Cleve & Grunow) Hustedt 1930 |
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| Navicula placentula f. latiuscula (Grunow in Cleve & Grunow) Hustedt 1930 |
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| Anomoeoneis serians f. thermalis (Grunow in Van Heurck) Hustedt 1930 |
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| Anomoeoneis styriaca (Grunow in Van Heurck) Hustedt 1930 |
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| Caloneis silicula f. curta (Grunow in Van Heurck) Hustedt 1930 |
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| Gomphonema longiceps f. suecica (Grunow in Van Heurck) Hustedt 1930 |
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| Navicula reinhardtii (reinhardti) f. gracilior (Grunow in Van Heurck) Hustedt 1930 |
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| Pinnularia microstauron f. diminuta (Grunow in Van Heurck) Hustedt 1930 |
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| Synedra amphicephala var. austriaca (Grunow in Van Heurck) Hustedt 1930 |
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| Synedra parasitica var. subconstricta (Grunow in Van Heurck) Hustedt 1930 |
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| Gomphonema longiceps var. subclavata (Grunow) Hustedt 1930 |
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| Gyrosigma peisonis (Grunow) Hustedt 1930 |
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| Navicula placentula f. lanceolata (Grunow) Hustedt 1930 |
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| Neidium affine (affinis) f. undulata (Grunow) Hustedt 1930 |
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| Synedra ulna var. ramesi (rameri) (Héribaud) Hustedt 1930 |
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| Pinnularia viridis var. sudetica (Hilse) Hustedt 1930 |
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| Anomoeoneis styriaca var. ventricosa (Hustedt) Hustedt 1930 |
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| Cymbella sinuata f. ovata (Hustedt) Hustedt 1930 |
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| Navicula tuscula f. obtusa (Hustedt) Hustedt 1930 |
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| Navicula tuscula f. rostrata (Hustedt) Hustedt 1930 |
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| Neidium dubium f. constricta (constrictum) (Hustedt) Hustedt 1930 |
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| Pinnularia interrupta f. minutissima (Hustedt) Hustedt 1930 |
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| Pinnularia major (maior) f. hyalina (Hustedt) Hustedt 1930 |
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| Surirella tenera f. subconstricta (Hustedt) Hustedt 1930 |
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| Navicula contenta f. elliptica (Krasske) Krasske in Hustedt 1930 |
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| Navicula dicephala var. neglecta (Krasske) Hustedt 1930 |
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| Navicula pupula var. aquaeductae (Krasske) Hustedt 1930 |
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| Navicula pupula var. mutata (Krasske) Hustedt 1930 |
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| Navicula pupula var. pseudopupula (Krasske) Hustedt 1930 |
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| Pinnularia subcapitata f. elliptica (Krasske) Hustedt 1930 |
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| Amphora coffeaeformis var. acutiuscula (Kützing) Hustedt 1930 |
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| Pinnularia microstauron var. brébissonii (Kützing) Hustedt 1930 |
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| Synedra acus var. radians (Kützing) Hustedt 1930 |
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| Synedra ulna var. aequalis (Kützing) Hustedt 1930 |
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| Pinnularia fasciata (Lagerstedt) Hustedt 1930 |
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| Campylodiscus noricus f. tenera (Mayer) Hustedt 1930 |
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| Frustulia rhomboides f. capitata (Mayer) Hustedt 1930 |
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| Frustulia rhomboides f. capitata (Mayer) Hustedt 1930 |
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| Navicula bacillum var. rostrata (Mayer) Hustedt 1930 |
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| Navicula placentula f. rostrata (Mayer) Hustedt 1930 |
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| Navicula viridula f. capitata (Mayer) Hustedt 1930 |
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| Neidium affine (affinis) f. hercynica (Mayer) Hustedt 1930 |
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| Pinnularia braunii var. amphicephala (Mayer) Hustedt 1930 |
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| Pinnularia hemiptera var. inconstans (Mayer) Hustedt 1930 |
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| Pinnularia major (maior) f. neglecta (Mayer) Hustedt 1930 |
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| Surirella (Suriraya) elegans var. constricta (Mayer) Hustedt 1930 |
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| Melosira granulata var. muzzanensis (Meister) Hustedt 1930 |
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| Denticula tenuis var. crassula (Naegeli in Kutzing) Hustedt 1930 |
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| Achnanthes lanceolata var. rostrata (Østrup) Hustedt 1930 |
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| Navicula halophila f. subcapitata (Østrup) Hustedt 1930 |
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| Navicula vitrea (Østrup) Hustedt 1930 |
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| Neidium bisulcatum f. undulata (Otto Müller) Hustedt 1930 |
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| Pinnularia microstauron f. biundulata (Otto Müller) Hustedt 1930 |
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| Pinnularia microstauron f. linearis (Otto Müller) Hustedt 1930 |
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| Fragilaria brevistriata var. inflata (Pantocsek) Hustedt 1930 |
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| Fragilaria brevistriata var. trigibba (Pantocsek) Hustedt 1930 |
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| Navicula contenta f. parallela (Petersen) Hustedt 1930 |
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| Caloneis zachariasi (Reichelt) Hustedt 1930 |
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| Caloneis bacillum var. lancettula (Schulz) Hustedt 1930 |
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| Synedra pulchella f. subconstricta (constricta) (Schulz) Hustedt 1930 |
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| Gomphonema longiceps f. montana (Schumann) Hustedt 1930 |
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| Achnanthes exigua var. constricta (Torka) Hustedt 1930 |
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| Campylodiscus clypeus var. bicostata (bicostatus) (W. Smith in Roper) Hustedt 1930 |
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| Eunotia monodon var. major (W. Smith) Hustedt 1930 |
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| Surirella ovata var. pinnata (W. Smith) Hustedt 1930 |
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| Synedra parasitica (W. Smith) Hustedt 1930 |
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| Biddulphia tridentata ‘Weisse’ according to Hustedt 1930 |
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| Navicula graciloides A. Mayer in Hustedt 1930 |
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| Achnanthes clevei var. rostrata Hustedt 1930 |
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| Achnanthes conspicua var. brevistriata Hustedt 1930 |
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| Achnanthes dispar var. angulata Hustedt 1930 |
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| Achnanthes kolbei Hustedt 1930 |
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| Achnanthes lacunarum Hustedt 1930 |
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| Achnanthes ploenensis Hustedt 1930 |
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| Amphiprora costata Hustedt 1930 |
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| Amphora holsatica Hustedt 1930 |
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| Caloneis ladogensis var. densestriata Hustedt 1930 |
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| Caloneis schumanniana var. lancettula Hustedt 1930 |
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| Caloneis silicula var. peisonis Hustedt 1930 |
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| Diploneis pseudovalis (pseudo-ovalis) Hustedt 1930 |
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| Eunotia arcus var. fallax Hustedt 1930 |
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| Eunotia exigua var. bidens Hustedt 1930 |
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| Eunotia exigua var. compacta Hustedt 1930 |
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| Eunotia meisteri Hustedt 1930 |
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| Eunotia meisteri var. bidens Hustedt 1930 |
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| Eunotia monodon f. bidens Hustedt 1930 |
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| Eunotia trinacria var. undulata Hustedt 1930 |
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| Eunotia valida Hustedt 1930 |
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| Fragilaria undata var. quadrata Hustedt 1930 |
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| Frustulia rhomboides f. undulata Hustedt 1930 |
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| Frustulia rhomboides f. undulata Hustedt 1930 |
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| Gomphonema angustatum var. linearis Hustedt 1930 |
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| Gomphonema longiceps f. gracilis Hustedt 1930 |
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| Gomphonema olivaceum var. minutissima Hustedt 1930 |
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| Hantzschia virgata var. gracilis Hustedt 1930 |
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| Melosira granulata f. curvata Hustedt 1930 |
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| Melosira granulata f. spiralis Hustedt 1930 |
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| Navicula disjuncta Hustedt 1930 |
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| Navicula integra var. truncata Hustedt 1930 |
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| Navicula kotschyi (kotschyana) f. undulata Hustedt 1930 |
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| Navicula krasskei Hustedt 1930 |
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| Navicula longirostris Hustedt 1930 |
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| Navicula pseudoscutiformis Hustedt 1930 |
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| Navicula pupula var. capitata Hustedt 1930 |
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| Navicula pupula var. elliptica Hustedt 1930 |
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| Navicula schoenfeldii Hustedt 1930 |
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| Navicula scutiformis f. minores Hustedt 1930 |
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| Navicula subhamulata var. undulata Hustedt 1930 |
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| Navicula subocculta Hustedt 1930 |
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| Navicula tuscula f. minor Hustedt 1930 |
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| Navicula verecunda Hustedt 1930 |
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| Navicula vitabunda Hustedt 1930 |
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| Neidium distincta-punctatum Hustedt 1930 |
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| Nitzschia frustulum var. subsalina Hustedt 1930 |
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| Pinnularia gibba var. linearis Hustedt 1930 |
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| Pinnularia lata f. thuringiaca Hustedt 1930 |
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| Stephanodiscus dubius Hustedt 1930 |
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| Surirella robusta f. hustedtiana Hustedt 1930 |
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| Surirella robusta f. punctata Hustedt 1930 |
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| Surirella (Suriraya) angusta (angustata) var. constricta Hustedt 1930 |
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| Surirella (Suriraya) angustata Hustedt 1930 |
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| Synedra pulchella f. constricta Hustedt 1930 |
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| Synedra ulna f. contracta Hustedt 1930 |
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| Navicula peregrina f. angusta Kolbe in Hustedt 1930 |
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| Navicula peregrina f. minor Kolbe in Hustedt 1930 |
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| Navicula salinarum f. minima Kolbe in Hustedt 1930 |
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| Navicula contempta Krasske 1930 |
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| Navicula hassiaca Krasske 1930 |
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| Stauroneis montana Krasske ex Hustedt 1930 |
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| Achnanthes grimmei Krasske in Hustedt 1930 |
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| Achnanthes grimmei var. elliptica Krasske in Hustedt 1930 |
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| Amphora delicatissima Krasske in Hustedt 1930 |
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| Amphora normanii var. undulata Krasske in Hustedt 1930 |
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| Diatomella balfouriana var. constricta Krasske in Hustedt 1930 |
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| Navicula creuzburgensis Krasske in Hustedt 1930 |
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| Navicula excelsa Krasske in Hustedt 1930 |
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| Navicula grimmei Krasske in Hustedt 1930 |
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| Navicula simplex Krasske in Hustedt 1930 |
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| Navicula söhrensis var. capitata Krasske in Hustedt 1930 |
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| Navicula soodensis Krasske in Hustedt 1930 |
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| Navicula ventralis Krasske in Hustedt 1930 |
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| Nitzschia gandersheimiensis Krasske in Hustedt 1930 |
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| Pinnularia subcapitata var. acuminata Krasske in Hustedt 1930 |
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| Neidium iridis f. conspicua Mayer ex Hustedt 1930 |
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| Pinnularia gibba f. semicruciata Mayer ex Hustedt 1930 |
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| Pinnularia gibba f. subundulata Mayer in Hustedt 1930 |
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| Pinnularia viridis var. diminuta Mayer in Hustedt 1930 |
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| Surirella biseriata f. punctata Meister in Hustedt 1930 |
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| Neidium kozlowi var. elliptica Mereschkowsky in Hustedt 1930 |
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| Neidium kozlowi var. parva Mereschkowsky in Hustedt 1930 |
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| Pinnularia subcapitata f. undulata Otto Müller ex Hustedt 1930 |
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| Navicula thermicola Petersen in Hustedt 1930 |
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| Navicula quadrisinuata Quint in Hustedt 1930 |
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| Navicula scoliopleuroides Quint in Hustedt 1930 |
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| Neidium iridis f. vernalis Reichelt ex Hustedt 1930 |
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| Achnanthes hauckiana var. rostrata Schulz ex Hustedt 1930 |
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| Achnanthes hauckiana var. elliptica Schulz ex Hustedt 1930 |
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| Navicula salinarum var. capitata Schulz in Hustedt 1930 |
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| Navicula bicontracta sensu Hustedt 1930 |
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| Stauroneis parvula sensu Hustedt 1930 |
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| Stauroneis parvula var. prominula sensu Hustedt 1930 |
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| Surirella tenera var. nervosa sensu Hustedt 1930 |
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