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| Coscinodiscus lacustris var. iris (Brun & Héribaud in Héribaud) Playfair 1914 |
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| Gomphonema augur var. rotundatum (Ehrenberg) Playfair 1914 |
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| Vanheurckia cuspidata var. ambigua (Ehrenberg) Playfair 1914 |
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| Vanheurckia cuspidata var. danaica (Grunow ex Cleve) Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. calida (Grunow in Cleve & Grunow; Grunow in Van Heurck) Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. victoriae (Grunow) Playfair 1914 |
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| Amphiprora alata var. holdereri (Gutwinski) Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. ovata (Lagerstedt) Playfair 1914 |
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| Melosira varians var. moniliformis (Otto Müller) Playfair 1914 |
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| Diadesmis confervacea var. peregrina (W. Smith) Playfair 1914 |
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| Cyclotella meneghiniana var. beta Kützing Bac. T. 30, f. 68 according to Playfair 1914 |
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| Achnanthes calcar var. australis Playfair 1914 |
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| Achnanthes calcar var. pulcherrima Playfair 1914 |
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| Amphora veneta var. grossestriata Playfair 1914 |
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| Cocconeis placentula var. australica Playfair 1914 |
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| Coscinodiscus lacustris var. denticulatus Playfair 1914 |
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| Coscinodiscus lacustris var. papillatus Playfair 1914 |
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| Coscinodiscus lacustris var. pellucidus Playfair 1914 |
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| Coscinodiscus lacustris var. stellatus Playfair 1914 |
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| Coscinodiscus lacustris var. tympaniformis Playfair 1914 |
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