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| Leudugeria janischiana var. obtusata Tempère in sched. in Forti 1913 |
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| Leudugeria janischiana var. subarcuata (Tempère in Tempère & Peragallo) Forti 1913 |
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| Lithodesmium ehrenbergii f. quadrigona dicentrica Forti 1913 |
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| Melosira clavigera var. crassiradiata (Forti in Tempère & Peragallo; Forti) Forti 1913 |
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| Melosira ornata var. reducta Forti 1913 |
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| Navicula aemilia Forti 1913 |
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| Navicula hennedyi var. aemilia Forti 1913 |
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| Navicula hennedyi (hennedii) var. brachypleura Forti 1913 |
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| Sceptroneis caduceus (caducea) var. abbreviata Forti 1913 |
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| Stephanogonia polyacantha (Forti) Forti 1913 |
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| Stephanogonia polyacantha var. inermis Forti 1913 |
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| Stephanogonia reticulata Forti 1913 |
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| Stephanopyxis eutycha (Ehrenberg) Forti 1913 |
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| Stephanopyxis grunowii f. monstrosa Forti 1913 |
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| Stictodiscus parallelus var. kinkerianus (Truan & Witt) Forti 1913 |
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| Triceratium cellulosum var. italica (italicum) Forti 1913 |
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| Triceratium exornatum var. gigantea Forti 1913 |
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| Triceratium flos var. intermedia Forti 1913 |
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| Triceratium flos var. italica Forti 1913 |
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| Triceratium latum var. dissimilis (Grunow) Forti 1913 |
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