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| Achnanthes delicatula var. pacis Frenguelli 1923 |
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| Amphora libyca var. cymbiformis Frenguelli 1923 |
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| Amphora libyca f. major Frenguelli 1923 |
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| Amphora perpusilla var. exilis (Grunow in Van Heurck) Frenguelli 1923 |
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| Anomoeoneis sculpta var. doliolus Frenguelli 1923 |
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| Anomoeoneis sculpta var. temperei Frenguelli 1923 |
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| Caloneis ventricosa var. elliptica Frenguelli 1923 |
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| Epithemia gibberula var. argentina (Brun in Brun & Tempère) Frenguelli 1923 |
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| Gomphonema augur var. capitulata Frenguelli 1923 |
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| Gomphonema clerici Frenguelli 1923 |
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| Gomphonema commutatum f. curta Frenguelli 1923 |
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| Gomphonema constrictum var. schmidtii Frenguelli 1923 |
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| Gomphonema constrictum var. schmidtii Frenguelli 1923 |
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| Gomphonema frickei Frenguelli 1923 |
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| Gomphonema parvulum var. lagenula (Kützing) Frenguelli 1923 |
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| Gyrosigma spenceri (spencerii) var. smithii (Grunow in Cleve & Grunow) Frenguelli 1923 |
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| Melosira granulata var. australiensis (Grunow) Frenguelli 1923 |
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| Melosira granulata var. tenuis Frenguelli 1923 |
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| Melosira perpusilla Frenguelli 1923 |
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| Microneis delicatula var. pacis Frenguelli 1923 |
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