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| Achnanthes subsessilis var. ovalis Dippel 1905 |
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| Amphipleura pellucida f. minor Dippel 1905 |
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| Cymatopleura elliptica f. minor Dippel 1905 |
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| Cymbella gastroides var. truncata (Rabenhorst) Dippel 1905 |
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| Cymbella ventricosa var. caespitosa (Kützing) Dippel 1905 |
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| Eunotia arcus f. curta (Grunow) Dippel 1905 |
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| Eunotia gracilis f. minor Dippel 1905 |
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| Gomphonema acuminatum f. intermedia Dippel 1905 |
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| Gomphonema acuminatum f. laticeps (Ehrenberg) Dippel 1905 |
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| Hantzschia amphioxys var. pusilla (Grunow) Dippel 1905 |
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| Melosira crenulata f. tenuis (Kützing) Dippel 1905 |
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| Navicula affinis var. intermedia Dippel 1905 |
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| Navicula cuspidata f. angusta Dippel 1905 |
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| Navicula cuspidata f. asymmetrica Dippel 1905 |
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| Navicula cuspidata f. capitata Dippel 1905 |
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| Navicula cuspidata f. craticula (Ehrenberg) Dippel 1905 |
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| Navicula cuspidata f. obtusa Dippel 1905 |
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| Navicula cuspidata f. primigena Dippel 1905 |
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| Navicula cuspidata f. subrostrata Dippel 1905 |
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| Navicula fulva f. asymmetrica Dippel 1905 |
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| Navicula gastrum f. minor Dippel 1905 |
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| Navicula iridis var. ampliata (Ehrenberg; Ehrenberg) Dippel 1905 |
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| Navicula iridis f. intermedia Dippel 1905 |
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| Navicula iridis var. media Dippel 1905 |
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| Navicula iridis f. minor Dippel 1905 |
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| Navicula oblonga (oblongata) var. lanceolata sensu Dippel 1905 |
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| Navicula ovalis var. oblongella (Naegeli in Kutzing) Dippel 1905 |
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| Navicula producta sensu Dippel 1905 |
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| Navicula reinhardtii (reinhardti) var. ovalis Dippel 1905 |
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| Navicula sphaerophora var. sculpta (Ehrenberg) Dippel 1905 |
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| Nitzschia angustata (angusta) var. acuta sensu Dippel 1905 |
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| Nitzschia angustata (angusta) f. curta Dippel 1905 |
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| Nitzschia tryblionella f. curta Dippel 1905 |
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| Nitzschia vitrea var. arcuata Dippel 1905 |
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| Pinnularia bicapitata (Lagerstedt) Dippel 1905 |
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| Pinnularia bicapitata var. interrupta (W. Smith) Dippel 1905 |
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| Pinnularia commutata (Grunow in Schmidt et al.) Dippel 1905 |
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| Pinnularia commutata var. rupestris (Hantzsch in Rabenhorst) Dippel 1905 |
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| Pinnularia major Dippel 1905 |
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| Pinnularia major (maior) f. linearis (Cleve) Dippel 1905 |
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| Pinnularia nobilis f. intermedia Dippel 1905 |
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| Pleurosigma acuminatum f. obtusa Dippel 1905 |
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| Pleurosigma acuminatum var. obtusa Dippel 1905 |
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| Pleurosigma scalproides var. minutula Dippel 1905 |
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| Stauroneis phoenicenteron var. brevis Dippel 1905 |
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| Stauroneis phoenicenteron var. gracilis Dippel 1905 |
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| Stauroneis phoenicenteron f. intermedia Dippel 1905 |
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| Stauroneis phoenicenteron f. truncata Dippel 1905 |
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| Stauroneis phoenicenteron var. vulgaris Dippel 1905 |
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| Surirella ovalis f. aequalis Dippel 1905 |
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| Surirella ovalis f. subovata Dippel 1905 |
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| Surirella robusta f. minor Dippel 1905 |
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| Surirella robusta f. minor Dippel 1905 |
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| Surirella (Suriraya) biseriata f. media Dippel 1905 |
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| Surirella (Suriraya) biseriata f. minor Dippel 1905 |
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