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| Achnanthes biasolettiana var. perminuta Grunow ex Van Heurck 1882-1885 |
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| Achnanthes biasolettiana var. sublinearis Grunow ex Van Heurck 1882-1885 |
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| Achnanthes gibberula var. angustior Grunow in Van Heurck 1882-1885 |
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| Achnanthes lanceolata f. minuta Grunow in Van Heurck 1882-1885 |
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| Actinocyclus subtilis var. subdivisa Grunow in Van Heurck 1882-1885 |
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| Amphipleura lindheimeri var. truanii Van Heurck 1882-1885 |
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| Amphora belgica Grunow 1882-1885 |
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| Amphora cymbifera var. gigantea Grunow in Van Heurck 1882-1885 |
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| Amphora laevissima var. perminuta Grunow in Van Heurck 1882-1885 |
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| Amphora perpusilla (Grunow in Van Heurck) Grunow in Van Heurck 1882-1885 |
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| Amphora scotica ‘Cleve’ according to Van Heurck 1882-1885 |
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| Amphora scotica f. minor Grunow in Van Heurck 1882-1885 |
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| Amphora taylori Grunow in Van Heurck 1882-1885 |
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| Cymbella affinis var. truncata Grunow in Van Heurck 1882-1885 |
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| Cymbella cuspidata var. obtusiuscula Grunow in Van Heurck 1882-1885 |
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| Cymbella helvetica var. abbreviata Grunow in Van Heurck 1882-1885 |
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| Cymbella helvetica var. obtusa Grunow in Van Heurck 1882-1885 |
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| Cymbella helvetica var. scotica Grunow in Van Heurck 1882-1885 |
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| Cymbella obtusa var. diminuta Grunow in Van Heurck 1882-1885 |
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| Cymbella subaequalis var. incerta (Grunow in Cleve & Möller) Grunow in Van Heurck 1882-1885 |
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| Cymbella turgidula var. brevis Grunow in Van Heurck 1882-1885 |
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| Denticula elegans var. ocellata (W. Smith) Grunow in Van Heurck 1882-1885 |
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| Diatoma vulgare var. distorta Grunow in Van Heurck 1882-1885 |
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| Encyonema ventricosum var. lunula Grunow in Van Heurck 1882-1885 |
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| Encyonema ventricosum f. perminuta Grunow in Van Heurck 1882-1885 |
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| Epithemia gibberula var. protracta Grunow in Van Heurck 1882-1885 |
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| Eunotia paludosa var. arculus Grunow in Van Heurck 1882-1885 |
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| Eupodiscus weissflogii Grunow in Van Heurck 1882-1885 |
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| Hantzschia hyalina Grunow in Van Heurck 1882-1885 |
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| Mastogloia braunii var. baldjikiana Grunow in Van Heurck 1882-1885 |
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| Micropodiscus weissflogii Grunow in Van Heurck 1882-1885 |
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| Navicula anglica var. subcruciata Grunow in Van Heurck 1882-1885 |
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| Navicula brebissonii var. bicuneata Grunow in Van Heurck 1882-1885 |
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| Navicula bulnheimii var. belgica Grunow in Van Heurck 1882-1885 |
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| Navicula cryptocephala var. intermedia Van Heurck 1882-1885 |
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| Navicula sudetica var. britannica Grunow in Van Heurck 1882-1885 |
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| Nitzschia linearis var. major Grunow in Van Heurck 1882-1885 |
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| Nitzschia linearis var. subsigmoidea Grunow in Van Heurck 1882-1885 |
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| Nitzschia normanii Van Heurck 1882-1885 |
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| Nitzschia subtilis var. mexicana Grunow in Van Heurck 1882-1885 |
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| Pinnularia undulata var. subundulata Grunow in Van Heurck 1882-1885 |
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| Pleurosigma scalprum var. gallicum Grunow in Van Heurck 1882-1885 |
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| Pleurosigma spenceri var. acutiuscula Grunow in Van Heurck 1882-1885 |
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| Synedra fulgens var. conspicua Grunow in Van Heurck 1882-1885 |
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