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| Navicula durandii (durrandii) f. rhomboidea (Castracane) Hustedt 1964 |
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| Navicula approximata var. finitima (Cleve) Hustedt 1964 |
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| Navicula clavata f. rhombica (Cleve) Hustedt 1964 |
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| Navicula hennedyi (hennedii) f. bacillifera (Cleve) Hustedt 1964 |
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| Navicula hennedyi (hennedii) f. undulata (Cleve) Hustedt 1964 |
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| Navicula irrorata f. mexicana (Cleve) Hustedt 1964 |
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| Navicula robertsiana (robertsoniana) f. bullata (Cleve) Hustedt 1964 |
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| Navicula sandriana f. laevis (Cleve) Hustedt 1964 |
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| Navicula spectabilis f. angelorum (Cleve) Hustedt 1964 |
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| Navicula spectabilis f. bullata (Cleve) Hustedt 1964 |
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| Navicula spectabilis f. emarginata (Cleve) Hustedt 1964 |
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| Navicula spectabilis f. madagascarensis (Cleve) Hustedt 1964 |
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| Navicula clavata f. indica (Greville) Hustedt 1964 |
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| Navicula hennedyi (hennedii) f. californica (Greville) Hustedt 1964 |
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| Navicula lyra f. recta (Greville) Hustedt 1964 |
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| Navicula lyra f. denudata (Grunow in Cleve) Hustedt 1964 |
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| Navicula hennedyi (hennedii) f. granulata (Grunow in Schmidt et al.) Hustedt 1964 |
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| Navicula robertsiana (robertsoniana) f. abnormis (Grunow in Schmidt et al.) Hustedt 1964 |
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| Navicula clavata f. elongata (H. Peragallo) Hustedt 1964 |
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| Navicula lyra f. americana (Heiden in Schmidt et al.) Hustedt 1964 |
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