Biddulphiaceae
| Attheya |
Bellerochea | Biddulphia | Cerataulus | |
| Cerataulina | Climacodium | Ditylum | Entogonia | |
| Eucampia | Hemiaulus | Huttoniella | Hydrosera | |
| Isthmia | Kittonia | Lithodesmium | Streptotheca | |
| Triceratium | Trinacria | Odontella # | ||
Mit # gekennzeichnete Gattungen sind nicht im Bestimmungsschlüssel erfaßt.
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| Attheya . |
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| Bellerochea . |
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| Biddulphia . |
2 | 3 | 4 | |
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| 5 . |
6 |
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| 7 . |
8 |
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| Cerataulus . |
2 |
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| Ditylum . |
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| Entogonia . |
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| Eucampia . |
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| Hemiaulus . |
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| Isthmia . |
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| Kittonia . |
2 |
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| Lithodesmium . |
2 |
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| Streptotheka . |
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| Triceratium . |
2 | 3 | 4 | |
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| 5 . |
6 | 7 | 8 | |
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| 9 . |
10 | 11 | 12 | |
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| 13 . |
14 |
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| 15 . |
16 |
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| Trinacria . |
2 |
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| Odontella
# . |