Achnanthes affinis var. affinis Grunow in Cleve & Grunow, 1880 accepted as Achnanthes affinis Grunow, 1880 accepted as Achnanthidium affine (Grunow) Czarnecki, 1994 (original description)
Achnanthes biasolettiana var. biasolettiana Grunow accepted as Achnanthes biasolettiana Grunow, 1880 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 accepted as Achnanthes pyrenaica var. pyrenaica Hustedt, 1939 (original description)
Achnanthes clevei var. clevei Grunow, 1880 (original description)
Achnanthes delicatula (Kützing) Grunow in Cleve & Grunow, 1880 accepted as Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844 (new combination reference)
Achnanthes exigua var. exigua Grunow in Cleve & Grunow, 1880 (original description)
Achnanthes hauckiana var. hauckiana Grunow in Cleve & Grunow, 1880 (original description)
Achnanthes lanceolata var. dubia Grunow, 1880 (original description)
Achnanthes linearis var. pusilla (Grunow) Cleve, 1895 accepted as Achnanthes pusilla Grunow in Cleve & Grunow, 1880 (original description)
Achnanthes pusilla Grunow in Cleve & Grunow, 1880 (original description)
Amphiprora kjellmanii var. kjellmanii Cleve in Cleve & Grunow, 1880 (original description)
Asterionella kariana Grunow, 1880 (original description)
Chaetoceros karianus Grunow, 1880 (original description)
Coscinodiscus granulosus var. granulosus Grunow in Cleve & Grunow, 1880 (original description)
Coscinodiscus hyalinus Grunow, 1880 (original description)
Coscinodiscus lacustris f. lacustris Grunow in Cleve & Grunow, 1880 (original description)
Coscinodiscus polyacanthus var. baltica Grunow in Cleve & Grunow, 1880 (original description)
Navicula costulata f. costlulata Cleve & Grunow, 1880 (original description)
Navicula crucicula var. protracta Grunow, 1880 (original description)
Navicula digitoradiata var. striolata Grunow, 1880 (original description)
Navicula fusioides Grunow, 1880 (original description)
Navicula gastrum var. latiuscula Grunow, 1880 (original description)
Navicula lundstroemii var. lundstroemii Cleve in Cleve & Grunow, 1880 (original description)
Navicula protracta Grunow, 1880 (original description)
Navicula rhynchocephala var. rostellata (Kützing) Cleve & Grunow, 1880 accepted as Navicula rostellata f. rostellata Kützing, 1844 (new combination reference)
Nitzschia acula (Kützing) Hantzsch, 1861 accepted as Synedra acula Kützing, 1844 (original description)
Nitzschia frigida Grunow, 1880 (original description)
Nitzschia kuetzingiana var. romana Grunow in Cleve & Grunow, 1880 (original description)
Nitzschia littoralis var. littoralis Grunow in Cleve & Grunow, 1880 (original description)
Nitzschia lorenziana var. subtilis Grunow, 1880 (original description)
Nitzschia palea var. debilis (Kützing) Grunow, 1880 accepted as Synedra debilis Kützing, 1844 (new combination reference)
Nitzschia palea var. perminuta Grunow in Cleve & Grunow, 1880 (original description)
Nitzschia scalpelliformis Grunow, 1880 (original description)
Nitzschia socialis var. baltica Grunow, 1880 (original description)
Nitzschia subtilis var. paleacea Grunow, 1880 (original description)
Nitzschia tryblionella var. salinarum Grunow in Cleve & Grunow, 1880 (original description)
Odontodiscus granulosus Grunow in Cleve & Grunow, 1880 † (original description)
Pleurosigma eximium (Thwaites) Grunow, 1880 accepted as Schizonema eximium Thwaites, 1848 (new combination reference)
Pleurosigma nodiferum Grunow, 1880 (original description)
Stephanodiscus hantzschii var. pusillus Grunow in Cleve & Grunow, 1880 (original description)
Thalassiothrix P.T. Cleve & A. Grunow, 1880 (original description)