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| Pleurosigma simile Grunow in Cleve & Grunow 1880 |
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| Pleurosigma sinense var. calcuttensis (calcutensis) Grunow in Cleve & Grunow 1880 |
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| Pleurosigma speciosum var. majus (major) Grunow in Cleve & Grunow 1880 |
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| Pleurosigma spenceri (spencerii) var. antillarum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma spenceri (spencerii) var. borealis Grunow in Cleve & Grunow 1880 |
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| Pleurosigma spencerii var. exilis Grunow in Cleve & Grunow 1880 |
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| Pleurosigma spencerii var. minutula Grunow in Cleve & Grunow 1880 |
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| Pleurosigma spencerii var. smithii Grunow in Cleve & Grunow 1880 |
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| Pleurosigma staurophorum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma strigosum var. convexum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma sulcatum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma tenuirostris Grunow in Cleve & Grunow 1880 |
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| Pleurosigma tenuissimum var. hyperborea Grunow in Cleve & Grunow 1880 |
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| Pleurosigma tenuissimum var. subtilissima Grunow in Cleve & Grunow 1880 |
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| Podosira ambigua var. kamtschatica Grunow in Cleve & Grunow 1880 |
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| Podosira febigeri (febigerii) Grunow in Cleve & Grunow 1880 |
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| Podosira maxima var. californica Grunow in Cleve & Grunow 1880 |
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| Rhoicosigma weissflogii Grunow in Cleve & Grunow 1880 |
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| Schizonema fastigiatum var. scotica Grunow in Cleve & Grunow 1880 |
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| Stauroneis anceps var. siberica Grunow in Cleve & Grunow 1880 |
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