| WebNameShort | |
| Gomphonema acuminatum f. acuminatoides Mayer 1928 |
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| Gomphonema acuminatum f. brebissoniformis Mayer 1928 |
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| Gomphonema acuminatum f. typica (Ehrenberg) Mayer 1928 |
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| Gomphonema angustatum var. naviculiformis Mayer 1928 |
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| Gomphonema angustatum f. typica Mayer 1928 |
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| Gomphonema angustatum f. typica Mayer 1928 |
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| Gomphonema angustatum f. undulata (Grunow ms. in Cleve) Mayer 1928 |
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| Gomphonema augur f. pusilla Mayer 1928 |
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| Gomphonema augur f. typica Mayer 1928 |
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| Gomphonema constrictum f. italicum (Kützing) Mayer 1928 |
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| Gomphonema constrictum f. obliqua Mayer 1928 |
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| Gomphonema constrictum f. robusta Mayer 1928 |
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| Gomphonema constrictum f. typica Mayer 1928 |
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| Gomphonema constrictum f. ventricosa (Gregory) Mayer 1928 |
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| Gomphonema gracile var. intricatiformis Mayer 1928 |
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| Gomphonema helveticum f. incurvatum (incurvata) (Brun) Mayer 1928 |
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| Gomphonema helveticum var. genuina Mayer 1928 |
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| Gomphonema helveticum var. undulatum Mayer 1928 |
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| Gomphonema insigne var. elongatum Mayer 1928 |
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| Gomphonema insigne var. fossilis Mayer 1928 |
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