Eupodiscus ralfsii var. ralfsii W. Smith, 1856 (original description)
Homoeocladia filiformis f. filiformis W. Smith, 1856 (original description)
Mastogloia G.H.K. Thwaites in W. Smith, 1856 (original description)
Melosira westii f. westii W. Smith, 1856 (original description)
Navicula hennedyi W.Smith, 1856 (original description)
Navicula hennedyii f. hennedyii W. Smith, 1856 (original description)
Navicula humerosa f. humerosa Brébisson ex W. Smith, 1856 (original description)
Navicula smithii f. smithii Brébisson in W. Smith, 1856 (original description)
Nitzschia curvula var. curvula W. Smith, 1856 (original description)
Odontidium mutabile W.Smith, 1856 accepted as Staurosirella pinnata var. intercedens (Grunow) P.B.Hamilton, 1994 accepted as Fragilaria mutabilis var. intercedens Grunow, 1881 (original description)
Odontidium mutabile var. mutabile W. Smith, 1856 (original description)
Odontidium parasiticum W.Smith, 1856 accepted as Pseudostaurosira parasitica (W.Smith) Morales, 2003 (original description)
Odontidium parasiticum var. parasiticum W. Smith, 1856 (original description)
Orthosira marina W. Smith, 1856 (original description)
Pinnularia hemiptera (Kützing) Rabenhorst, 1853 (new combination reference)
Schizonema cruciger f. cruciger W. Smith, 1856 (original description)
Synedra undulata (J.W.Bailey) Gregory, 1857 accepted as Toxarium undulatum Bailey, 1854 (new combination reference)
Tryblionella levidensis W.Smith, 1856 (original description)