Amphora ostrearia var. belgica Grunow in Van Heurck, 1885 (original description)
Amphora ostrearia var. quadrata (Brébisson ex Kützing) Rabenhorst, 1864 accepted as Amphora quadrata Brébisson ex Kützing, 1849 (new combination reference)
Amphora ovalis f. affinis (Kützing) Van Heurck, 1885 accepted as Amphora affinis f. affinis Kützing, 1844 (new combination reference)
Amphora ovalis f. exilis (Grunow in Van Heurck) Grunow in Van Heurck, 1885 accepted as Amphora pediculus var. exilis Grunow in Van Heurck, 1880 (new combination reference)
Amphora ovalis f. minor (Grunow in Van Heurck) Grunow in Van Heurck, 1885 accepted as Amphora pediculus var. minor Grunow in Van Heurck, 1880 (new combination reference)
Amphora ovalis f. minor (Grunow in Van Heurck) Van Heurck, 1885 accepted as Amphora affinis f. minor Grunow in Van Heurck, 1880 (new combination reference)
Amphora ovalis f. pediculus (Kützing) Van Heurck, 1885 accepted as Cymbella pediculus Kützing, 1844 (new combination reference)
Amphora ovalis var. gracilis (Ehrenberg) van Heurck, 1885 accepted as Amphora gracilis f. gracilis Ehrenberg, 1843 (new combination reference)
Amphora perpusilla var. perpusilla (Grunow in Van Heurck) Grunow in Van Heurck, 1885 accepted as Amphora globulosa var. perpusilla Grunow, 1880 (new combination reference)
Amphora salina var. minor Van Heurck, 1885 (original description)
Anaulus debilis (Grunow in Van Heurck) Van Heurck, 1885 accepted as Eunotogramma debile Grunow in Van Heurck, 1883 (new combination reference)
Bellerochea H. Van Heurck, 1885 (original description)
Bellerochea malleus f. malleus (Brightwell) Van Heurck, 1885 accepted as Triceratium malleus var. malleus Brightwell, 1858 (new combination reference)
Biddulphia alternans var. alternans (J.W. Bailey) Van Heurck, 1885 accepted as Triceratium alternans f. alternans J.W. Bailey, 1851 (new combination reference)
Biddulphia antediluviana var. antediluviana (Ehrenberg) Van Heurck, 1885 accepted as Amphitetras antediluviana var. antediluviana Ehrenberg, 1840 (new combination reference)
Biddulphia sculpta (Shadbolt) Van Heurck, 1885 accepted as Triceratium sculptum var. sculptum Shadbolt, 1854 (new combination reference)
Biddulphia smithii (Ralfs in Pritchard) Van Heurck, 1885 accepted as Ralfsiella smithii (Ralfs in Pritchard) P.A. Sims, D. M. Williams & Ashworth, 2018 (new combination reference)
Campylosira A. Grunow ex H. Van Heurck, 1885 (original description)
Chaetoceros varians Van Heurck, 1885 (original description)
Cocconeis placentula f. lineata (Ehrenberg) Hustedt, 1957 accepted as Cocconeis lineata Ehrenberg, 1843 (new combination reference)
Coscinodiscus rothii var. normani (Gregory ex Greville) Van Heurck, 1928 accepted as Coscinodiscus normanii Gregory ex Greville, 1859 (new combination reference)
Coscinodiscus subtilis f. rothii (Ehrenberg) Van Heurck, 1885 accepted as Heterostephania rothii var. rothii Ehrenberg, 1854 (new combination reference)
Coscinodiscus subtilis var. normannii (Gregory) Van Heurck, 1885 accepted as Coscinodiscus normanii Gregory ex Greville, 1859 (new combination reference)
Cyclotella meneghiniana f. minor Van Heurck, 1885 (original description)
Cyclotella operculata var. radiosa Grunow in Schneider, 1878 (original description)
Cymbella cistula var. maculata (Kützing) Van Heurck, 1885 accepted as Frustulia maculata Kützing, 1833 (new combination reference)
Cymbella cymbiformis var. parva (W.Smith) Van Heurck, 1885 accepted as Cocconema parvum W.Smith, 1853 (new combination reference)
Cymbella leptoceros var. elongata Van Heurck, 1885 (original description)
Cymbella microcephala Grunow in Van Heurck, 1885 accepted as Encyonopsis microcephala (Grunow) Krammer, 1997 (original description)
Diatoma elongatum var. hybrida (Grunow) Cleve-Euler, 1912 accepted as Diatoma tenue var. hybrida Grunow in Van Heurck, 1881 (new combination reference)
Diatoma elongatum var. tenuis (C.A. Agardh) Van Heurck, 1885 accepted as Diatoma tenue C. Agardh, 1812 (new combination reference)
Dimeregramma minor var. nana (Gregory) Van Heurck, 1885 accepted as Plagiogramma minus var. nanum (W. Gregory) Chunlian Li, Ashworth & Witkowski in Li et al., 2020 (new combination reference)
Donkinia recta (Donkin) Grunow, 1883 accepted as Pleurosigma rectum Donkin, 1858 (new combination reference)
Epithemia musculus var. constricta (Brebisson cum specim.) Van Heurck, 1885 (new combination reference)
Eunotia flexuosa var. bicapitata Grunow in Van Heurck, 1881 (new combination reference)
Fragilaria brevistriata f. brevistriata Grunow in Van Heurck, 1885 (original description)
Fragilaria crotonensis var. prolongata Grunow, 1885 accepted as Synedra crotonensis f. prolongata Grunow in Van Heurck, 1881 (new combination reference)
Gomphonema augur var. gautieri Van Heurck, 1885 (original description)
Gomphonema gracile var. auritum (A.K.H.Braun) H.F.Van Heurck, 1885 accepted as Gomphonema auritum f. auritum Braun in litt., Kutzing, 1849 (new combination reference)
Gomphonema gracile var. dichotomum (Kützing partim.; W.Smith) Grunow, 1880 accepted as Gomphonema dichotomum W. Smith (new combination reference)
Gomphonema montanum var. commutatum (Grunow) Grunow, 1885 accepted as Gomphonema commutatum f. commutatum Grunow in Van Heurck, 1880 (new combination reference)
Gomphonema olivaceum f. vulgaris (Kützing) J.Frenguelli, 1924 accepted as Sphenella vulgaris Kützing, 1844 (new combination reference)
Grammatophora marina var. communis Grunow ex Van Heurck, 1880 accepted as Grammatophora oceanica var. communis Grunow, 1881 (new combination reference)
Grammatophora marina var. macilenta (W. Smith) Van Heurck, 1885 accepted as Grammatophora macilenta var. macilenta W. Smith, 1856 (new combination reference)
Grammatophora marina var. subtilissima (J.W. Bailey ex Ralfs in Pritchard) Van Heurck, 1885 (new combination reference)
Grammatophora marina var. vulgaris (Grunow) Van Heurck, 1885 accepted as Grammatophora oceanica var. vulgaris Grunow, 1881 (new combination reference)
Melosira crenulata f. binderana (Kützing) Van Heurck, 1885 accepted as Melosira italica var. binderiana Kützing, 1844 (new combination reference)
Melosira crenulata f. tenuis (Kützing) Van Heurck, 1885 accepted as Melosira tenuis var. tenuis Kützing, 1844 (new combination reference)
Melosira juergensii var. octagona Grunow in Van Heurck, 1885 (original description)
Micropodiscus A. Grunow in H. Van Heurck, 1885 accepted as Conticribra K. Stachura-Suchoples & D.M. Williams, 2009 (original description)
Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (new combination reference)
Navicula brevis var. elliptica Van Heurck, 1885 (original description)
Navicula cancellata var. ammophila (Grunow) De Toni, 1891 accepted as Navicula ammophila f. ammophila Grunow, 1882 (new combination reference)
Navicula cancellata var. scaldensis Van Heurck, 1885 (original description)
Navicula cari var. angusta (Grunow) Grunow, 1885 accepted as Navicula angusta Grunow, 1860 (new combination reference)
Navicula cincta f. minuta van Heurck, 1885 (original description)
Navicula contenta f. contenta Grunow in Van Heurck, 1885 (original description)
Navicula cuspidata var. halophila Grunow, 1885 (original description)
Navicula digitoradiata var. cyprinus (Ehrenberg) W.Smith accepted as Pinnularia cyprinus Ehrenberg, 1843 (new combination reference)
Navicula elliptica f. minima Van Heurck, 1885 (original description)
Navicula fontinalis Grunow, 1885 accepted as Caloneis fontinalis (Grunow) Cleve-Euler, 1932 (original description)
Navicula gibba sensu Van Heurck, 1885 (original description)
Navicula gibba var. brevistriata van Heurck, 1885 (original description)
Navicula gracilis var. schizonemoides Van Heurck, 1885 (original description)
Navicula hennedyi var. clavata (Gregory) Van Heurck, 1885 accepted as Navicula clavata f. clavata Gregory, 1856 (new combination reference)
Navicula johnsonii var. belgica Van Heurck, 1885 (original description)
Navicula lanceolata f. arenaria (Donkin) Van Heurck, 1885 (new combination reference)
Navicula lanceolata var. phyllepta (Kützing) van Heurck, 1885 accepted as Navicula phyllepta Kützing, 1844 (new combination reference)
Navicula liburnica var. liburnica Grunow in Van Heurck, 1885 (original description)
Navicula mesolepta var. termes (Ehrenberg) Van Heurck (original description)
Navicula nobilis var. dactylus (Ehrenberg) Van Heurck, 1885 accepted as Pinnularia dactylus f. dactylus Ehrenberg, 1843 (new combination reference)
Navicula palpebralis f. angulosa (Gregory) Van Heurck, 1885 accepted as Navicula angulosa f. angulosa Gregory, 1856 (new combination reference)
Navicula palpebralis f. barclayana (Gregory) Van Heurck, 1885 accepted as Navicula barclayana f. barclayana Gregory, 1857 (new combination reference)
Navicula palpebralis var. barclayana sensu Van Heurck, 1885 (original description)
Navicula palpebralis var. obtusa Van Heurck, 1885 (original description)
Navicula peregrina f. upsaliensis (Grunow) van Heurck, 1885 accepted as Navicula gastrum var. upsaliensis Grunow in Cleve & Möller, 1879 (new combination reference)
Navicula radiosa var. tenella (Brébisson ex Kützing) Van Heurck, 1885 accepted as Navicula tenella var. tenella Brebisson in Kutzing, 1849 (new combination reference)
Navicula reinhardti var. gracilior Grunow in Van Heurck, 1885 (original description)
Navicula retusa sensu Van Heurck, 1885 (original description)
Navicula sublinearis Grunow, 1885 (original description)
Navicula subretusa Grunow, 1885 (original description)
Navicula viridula var. avenacea (Brébisson) van Heurck, 1885 accepted as Pinnularia radiosa Rabenhorst, 1853 (new combination reference)
Navicula viridula var. slesvicensis (Grunow) van Heurck, 1885 (new combination reference)
Nitzschia delognei Grunow, 1880 (original description)
Nitzschia frustulum var. perpusilla (Rabenhorst) Van Heurck, 1885 accepted as Nitzschia perpusilla f. perpusilla Rabenhorst, 1861 (new combination reference)
Nitzschia longissima var. closterium (Ehrenberg) Van Heurck, 1885 accepted as Ceratoneis closterium Ehrenberg, 1839 (new combination reference)
Nitzschia microcephala var. elegantula (Grunow) van Heurck, 1885 accepted as Nitzschia elegantula Grunow, 1881 (new combination reference)
Nitzschia obtusa var. brevissima Van Heurck, 1885 (original description)
Nitzschia obtusa var. nana Grunow, 1885 (original description)
Nitzschia tryblionella var. calida Grunow (new combination reference)
Nitzschia vitrea var. recta (Hantzsch; Grunow) van Heurck, 1885 accepted as Nitzschia recta f. recta Hantzsch ex Rabenhorst, 1862 (new combination reference)
Plagiotropis elegans var. elegans (W. Smith) Grunow in Van Heurck, 1885 accepted as Amphiprora elegans var. elegans W. Smith, 1856 (new combination reference)
Pleurosigma affine var. nicobarica Grunow in Van Heurck, 1885 (original description)
Pleurosigma angulatum var. aestuarii (Brébisson) van Heurck, 1885 accepted as Navicula aestuarii Brébisson ex Kützing, 1849 (new combination reference)
Pleurosigma angulatum var. delicatulum (W.Smith) van Heurck, 1885 accepted as Pleurosigma delicatulum var. delicatulum W. Smith, 1852 (new combination reference)
Pleurosigma angulatum var. elongatum (W.Smith) van Heurck, 1885 accepted as Pleurosigma elongatum var. elongatum W. Smith, 1852 (new combination reference)
Pleurosigma angulatum var. quadratum (W.Smith) Van Heurck, 1885 accepted as Pleurosigma quadratum var. quadratum W. Smith, 1853 (new combination reference)
Pleurosigma angulatum var. strigosa (W. Smith) Van Heurck, 1885 accepted as Pleurosigma strigosum var. strigosum W. Smith, 1852 (new combination reference)
Rhaphoneis belgica var. belgica (Grunow in Van Heurck) Grunow in Van Heurck, 1885 accepted as Rhaphoneis pretiosa var. belgica Grunow in Van Heurck, 1881 (new combination reference)
Rhaphoneis caduceus (Ehrenberg) Heurck, 1885 accepted as Sceptroneis caduceus var. caduceus Ehrenberg, 1844 (1845) (new combination reference)