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| Synedra ulna var. danica (Kützing) Grunow in Van Heurck 1885 |
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| Synedra ulna var. lanceolata (Kützing) Van Heurck 1885 |
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| Synedra ulna var. oxyrhynchus (Kützing) Van Heurck 1885 |
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| Synedra ulna var. splendens (Kützing) Van Heurck 1885 |
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| Synedra affinis var. fasciculata (Lyngbye; Kutzing) Grunow in Van Heurck 1885 |
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| Nitzschia frustulum var. perpusilla (Rabenhorst) Van Heurck 1885 |
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| Biddulphia smithii (Ralfs in Pritchard) Van Heurck 1885 |
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| Biddulphia sculpta (Shadbolt) Van Heurck 1885 |
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| Vanheurckia vulgaris (Thwaites) Van Heurck 1885 |
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| Cymbella cymbiformis var. parva (W. Smith) Van Heurck 1885 |
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| Gomphonema gracile var. dichotomum (W. Smith) Van Heurck 1885 |
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| Grammatophora marina var. macilenta (W. Smith) Van Heurck 1885 |
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| Navicula iridis var. producta (W. Smith) Van Heurck 1885 |
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| Plagiotropis elegans (W. Smith) Grunow in Van Heurck 1885 |
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| Pleurosigma angulatum var. delicatulum (W. Smith) Van Heurck 1885 |
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| Pleurosigma angulatum var. elongatum (W. Smith) Van Heurck 1885 |
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| Pleurosigma angulatum var. quadratum (W. Smith) Van Heurck 1885 |
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| Pleurosigma angulatum var. strigosa (strigosum) (W. Smith) Van Heurck 1885 |
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| Surirella ovalis var. pinnata (W. Smith) Van Heurck 1885 |
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| Surirella (Suriraya) fastuosa var. lata (W. Smith) Van Heurck 1885 |
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