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| Pleurosigma elongatum var. gracilescens (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma hyperborea (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma intermedium var. directum (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma longum var. kerguelense (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma o'mearii (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma rhombeum (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma rigidum var. gruendleri (grundlerii) (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Rhoicosigma lineare (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma barbadense (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma longum var. subrigida (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma spenceri (spencerii) var. febigeri (febigerii) (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma gallicum (Grunow in Van Heurck) H. Peragallo 1891 |
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| Pleurosigma balticum var. lorenzii (Grunow) H. Peragallo 1891 |
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| Pleurosigma pusillum var. salinarum (Grunow) H. Peragallo 1891 |
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| Pleurosigma strigilis var. tropica (Grunow) H. Peragallo 1891 |
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| Pleurosigma distortum var. parkeri (Harrison) H. Peragallo 1891 |
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| Pleurosigma strigilis var. longinum (P. Smith ex Brightwell) H. Peragallo 1891 |
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| Pleurosigma strigilis var. capensis (Petit) H. Peragallo 1891 |
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| Gyrosigma spenceri (spencerii) var. scalproides (Rabenhorst) H. Peragallo 1891 |
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| Pleurosigma spenceri (spencerii) var. scalproides (Rabenhorst) H. Peragallo 1891 |
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