Acanthoceras Kützing, 1842 accepted as Ceramium Roth, 1797 (original description)
Acanthoceras shuttleworthianum Kützing, 1842 accepted as Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847 (original description)
Centroceras leptacanthum Kützing, 1841 accepted as Centroceras micracanthum Kützing, 1841 (original description)
Ceramium barbatum Kützing, 1842 accepted as Ceramium rubrum var. barbatum Feldmann-Mazoyer, 1941 (original description)
Echinoceras hirsutum Kützing, 1842 (original description)
Echinoceras hystrix Kützing, 1842 (original description)
Echinoceras imbricatum Kützing, 1842 (original description)
Echinoceras pellucidum Kützing, 1841 (original description)
Echinoceras puberulum Kützing, 1842 (original description)
Echinoceras spinulosum Kützing, 1842 accepted as Ceramium spinulosum (Kützing) Rabenhorst, 1847 accepted as Ceramium ciliatum var. robustum (J.Agardh) Mazoyer, 1938 (original description)
Hormoceras biasolettianum Kützing, 1842 (original description)
Hormoceras confluens Kützing, 1842 accepted as Ceramium circinatum (Kützing) J.Agardh, 1851 (original description)
Hormoceras decurrens Kützing, 1842 accepted as Ceramium circinatum (Kützing) J.Agardh, 1851 (original description)
Hormoceras duriusculum Kützing, 1842 (original description)
Hormoceras moniliforme Kützing, 1842 (original description)
Hormoceras perversum Kützing, 1842 (original description)
Hormoceras polyceras Kützing accepted as Ceramium polyceras (Kützing) Zanardini, 1847 (original description)
Hormoceras transfugum Kützing, 1842 (original description)
Spyridia cuspidata Kützing, 1842 (original description)
Spyridia divaricata Kützing, 1842 (original description)
Spyridia fruticulosa Kützing, 1842 (original description)
Spyridia nudiuscula Kützing, 1842 (original description)
Spyridia setacea Kützing, 1842 (original description)
Spyridia villosa Kützing, 1842 (original description)