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| Achnanthes calcar var. australis Playfair 1914 |
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| Achnanthes calcar var. pulcherrima Playfair 1914 |
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| Amphiprora alata var. holdereri (Gutwinski) 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. iris (Brun & Héribaud in Héribaud) 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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| Cyclotella meneghiniana var. beta Kützing Bac. T. 30, f. 68 according to Playfair 1914 |
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| Cyclotella meneghiniana var. brevistriata Playfair 1914 |
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| Cyclotella meneghiniana var. convexa Playfair 1914 |
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| Cyclotella meneghiniana var. fluviatilis Playfair 1914 |
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| Cyclotella meneghiniana var. quadrata Playfair 1914 |
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| Diadesmis confervacea var. peregrina (W. Smith) Playfair 1914 |
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| Diploneis boldtiana var. acuminata Playfair 1914 |
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| Diploneis boldtiana var. australica Playfair 1914 |
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| Diploneis boldtiana var. ovalis Playfair 1914 |
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| Epithemia gibberula var. perpusilla Playfair 1914 |
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| Eunotia formica var. richmondiae Playfair 1914 |
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| Gomphonema augur var. angulatum Playfair 1914 |
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| Gomphonema augur var. angulatum Playfair 1914 |
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| Gomphonema augur var. rotundatum (Ehrenberg) Playfair 1914 |
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| Gomphonema constrictum var. australe Playfair 1914 |
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| Gomphonema triangulare Playfair 1914 |
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| Melosira varians var. moniliformis (Otto Müller) Playfair 1914 |
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| Navicula mutica var. ovalis Playfair 1914 |
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| Navicula mutica var. rhomboidea Playfair 1914 |
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| Navicula mutica var. subcircularis Playfair 1914 |
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| Navicula mutica var. subhexagona Playfair 1914 |
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| Nitzschia paradoxa var. perpusilla Playfair 1914 |
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| Nitzschia vermicularis var. minuta Playfair 1914 |
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| Nitzschia vermicularis var. sialis Playfair 1914 |
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| Surirella ovalis var. lewisii Playfair 1914 |
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| Surirella plana var. algensis Playfair 1914 |
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| Synedra lismorensis Playfair 1914 |
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| Tryblionella cruciata Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. australica 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. minor Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. ovata (Lagerstedt) Playfair 1914 |
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| Tryblionella hantzschiana (hantzschia) var. victoriae (Grunow) 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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| Vanheurckia cuspidata var. kyoglensis Playfair 1914 |
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| Vanheurckia rhomboides f. minor Playfair 1914 |
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