| WebNameShort | |
| Neidium affine (affinis) f. latior Mayer 1925 |
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| Neidium affine (affinis) f. minor subf. subrostratum Mayer 1925 |
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| Neidium affine (affinis) var. undulatum sensu Mayer 1925 |
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| Neidium amphigomphoides Mayer 1925 |
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| Neidium bisulcatum var. linearis Mayer 1925 |
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| Neidium dubium var. capitatum Mayer 1925 |
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| Neidium hercynicum f. angustior Mayer 1925 |
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| Neidium hercynicum var. ovalis Mayer 1925 |
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| Neidium hercynicum var. ovalis Mayer 1925 |
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| Neidium iridis var. amphigomphus sensu Mayer 1925 |
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| Neidium iridis var. undulatum Mayer 1925 |
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| Pinnularia borealis subsp. genuina Mayer 1925 |
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| Pinnularia borealis f. intermedia Mayer 1925 |
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| Pinnularia borealis f. rotundata Mayer 1925 |
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| Pinnularia borealis subsp. scalaris Mayer 1925 |
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| Pinnularia borealis var. scalaris sensu Mayer 1925 |
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| Pinnularia lata f. elliptica Mayer 1925 |
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| Pinnularia lata f. minuta Mayer 1925 |
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| Pinnularia lata f. truncata Mayer 1925 |
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| Pinnularia lata f. typica Mayer 1925 |
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