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| Plagiotropis vitrea var. lindigii Grunow in Cleve & Grunow 1880 |
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| Pleurosigma acuminatum var. curta Grunow in Cleve & Grunow 1880 |
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| Pleurosigma aestuarii (aestuarium) var. minuta (minutum, minuata) (Grunow in Cleve & Möller) Grunow in Cleve & Grunow 1880 |
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| Pleurosigma affine var. fossilis Grunow in Cleve & Grunow 1880 |
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| Pleurosigma affine var. marylandica Grunow in Cleve & Grunow 1880 |
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| Pleurosigma angulatum var. undulata Grunow in Cleve & Grunow 1880 |
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| Pleurosigma baileyi Grunow in Cleve & Grunow 1880 |
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| Pleurosigma balticum var. constrictum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma balticum var. diminutum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma balticum var. similis (simile) Grunow in Cleve & Grunow 1880 |
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| Pleurosigma brebissonii Grunow in Cleve & Grunow 1880 |
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| Pleurosigma clevei Grunow in Cleve & Grunow 1880 |
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| Pleurosigma constrictum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma delicatulum var. kariana Grunow in Cleve & Grunow 1880 |
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| Pleurosigma diminutum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma directum Grunow in Cleve & Grunow 1880 |
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| Pleurosigma elongatum var. fallax Grunow in Cleve & Grunow 1880 |
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| Pleurosigma eximium (Thwaites) Grunow in Cleve & Grunow 1880 |
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| Pleurosigma fallax Grunow in Cleve & Grunow 1880 |
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| Pleurosigma fasciolum (fasciola) var. sulcatum Grunow in Cleve & Grunow 1880 |
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