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| Achnanthes brevipes var. subsessilis (Kützing) Frenguelli 1930 |
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| Actinoptychus undulatus f. minor Frenguelli 1930 |
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| Amphora pallida Frenguelli 1930 |
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| Aulacodiscus petersii f. pentamera Frenguelli 1930 |
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| Aulacodiscus petersii f. tetramera Frenguelli 1930 |
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| Berkeleya rutilans f. obtusa (Greville) Frenguelli 1930 |
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| Biddulphia rhombus var. atlantica Frenguelli 1930 |
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| Biddulphia roperiana f. discigera (Grunow in Van Heurck) Frenguelli 1930 |
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| Biddulphia roperiana f. obtusa (Kützing) Frenguelli 1930 |
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| Cocconeis scutellum var. schmidtii Frenguelli 1930 |
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| Coscinodiscus radiatus f. minima Frenguelli 1930 |
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| Coscinodiscus sublineatus f. minor Frenguelli 1930 |
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| Entopyla auastralis var. minuscula Frenguelli 1930 |
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| Grammatophora gibberula f. major Frenguelli 1930 |
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| Grammatophora gibberula f. minor Frenguelli 1930 |
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| Grammatophora oceanica f. minor (Grunow) Frenguelli 1930 |
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| Hyalodiscus stelliger f. major Frenguelli 1930 |
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| Licmophora lyngbyei f. abbreviata (Agardh) Frenguelli 1930 |
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| Licmophora lyngbyei f. elongata (Grunow in Van Heurck) Frenguelli 1930 |
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| Nitzschia majuscula var. curvirostris Frenguelli 1930 |
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