Amphipleura rutilans var. dillwynii (Agardh) Cleve-Euler, 1952 accepted as Schizonema dillwynii var. dillwynii Agardh, 1824 (new combination reference)
Amphiprora alata var. genuina Cleve-Euler, 1952 (original description)
Amphiprora hyperborea var. genuina Cleve-Euler, 1952 (original description)
Amphiprora hyperborea var. minuta (Grunow) Cleve-Euler, 1952 accepted as Amphiprora hyperborea f. minuta Grunow, 1884 (new combination reference)
Amphiprora kjellmanii var. typica Cleve-Euler, 1952 (original description)
Amphiprora ornata var. genuina Cleve-Euler, 1952 (original description)
Amphiprora ornata var. rectangulata (Cleve-Euler) Cleve-Euler, 1952 accepted as Amphiprora rectangulata Cleve-Euler, 1934 (new combination reference)
Amphiprora paludosa var. genuina Cleve-Euler, 1952 (original description)
Campylodiscus echeneis f. minor Cleve-Euler, 1955 (original description)
Campylodiscus hibernicus var. armatus Cleve-Euler, 1952 (original description)
Campylodiscus hibernicus var. hungaricus (Pantocsek) Cleve-Euler, 1952 accepted as Campylodiscus noricus var. hungarica Pantocsek, 1902 (new combination reference)
Cylindrotheca gracilis var. minor Cleve-Euler, 1952 (original description)
Cymatopleura elliptica f. apiculata Cleve-Euler, 1952 (original description)
Cymatopleura elliptica f. curta Cleve-Euler, 1952 (original description)
Cymatopleura elliptica var. brunii (Petit) Cleve-Euler, 1952 accepted as Cymatopleura brunii Petit, 1895 (new combination reference)
Cymatopleura elliptica var. incisa Cleve-Euler, 1952 (original description)
Cymatopleura elliptica var. turicensis (Meister) Cleve-Euler, 1952 accepted as Cymatopleura turicensis Meister, 1912 (new combination reference)
Cymatopleura solea f. angulosa Cleve-Euler, 1952 (original description)
Cymatopleura solea f. marina according to Cleve-Euler (original description)
Cymatopleura solea f. striolata Cleve-Euler, 1952 (original description)
Cymatopleura solea var. graciloides Cleve-Euler, 1952 (original description)
Cymatopleura solea var. intermedia (Peragallo & Peragallo) Cleve-Euler accepted as Cymatopleura intermedia Peragallo & Peragallo, 1899 (new combination reference)
Cymatopleura solea var. kochii (Pantocsek) Cleve-Euler, 1952 accepted as Surirella kochii Pantocsek, 1892 (new combination reference)
Cymatopleura solea var. palffyi (Pantocsek) Cleve-Euler, 1952 accepted as Surirella palffyi Pantocsek, 1902 (new combination reference)
Cymatopleura solea var. parallela (W. Smith) Cleve-Euler, 1853 accepted as Cymatopleura parallela W. Smith, 1853 (new combination reference)
Denticula tenuis var. tenuirostris Cleve-Euler, 1952 (original description)
Epithemia argus f. monstrosa Cleve-Euler, 1955 accepted as Epithemia argus (Ehrenberg) Kützing, 1844 accepted as Eunotia argus Ehrenberg, 1843 (original description)
Epithemia argus var. constricta Cleve-Euler, 1952 (original description)
Epithemia argus var. perminuta Cleve-Euler, 1952 (original description)
Epithemia argus var. triangulata Cleve-Euler, 1952 (original description)
Epithemia goeppertiana f. rostrata Cleve-Euler, 1952 (original description)
Epithemia hyndmanii var. genuina Cleve-Euler, 1952 (original description)
Epithemia proboscidea var. acuta (Cleve-Euler) Cleve-Euler, 1952 accepted as Epithemia cistula var. acuta Cleve-Euler, 1932 (new combination reference)
Epithemia proboscidea var. amphicephala (Østrup) Cleve-Euler, 1952 accepted as Epithemia sorex var. amphicephala Østrup, 1897 (new combination reference)
Epithemia proboscidea var. typica Cleve-Euler, 1952 (original description)
Epithemia sorex f. undulata (Cleve-Euler) Cleve-Euler, 1952 accepted as Epithemia sorex var. undulata Cleve-Euler, 1932 (new combination reference)
Epithemia sorex var. genuina Cleve-Euler, 1952 (original description)
Epithemia sorex var. perundulata (Cleve-Euler in Backman & Cleve-Euler) Cleve-Euler, 1952 accepted as Epithemia cistula var. undulata Cleve-Euler in Backmann & Cleve-Euler, 1922 (new combination reference)
Epithemia sorex var. perundulata Cleve-Euler, 1952 (original description)
Epithemia turgida f. curta Cleve-Euler, 1952 (original description)
Epithemia zebra f. amphicephala (Grunow) Cleve-Euler, 1952 accepted as Epithemia argus var. amphicephala Grunow, 1881 (new combination reference)
Epithemia zebra f. bidens (A. Cleve) Cleve-Euler, 1952 accepted as Epithemia zebra var. bidens A. Cleve, 1895 (new combination reference)
Epithemia zebra f. longissima (M. Peragallo & Heribaud in Heribaud) Cleve-Euler, 1952 accepted as Epithemia zebra var. longissima M. Peragallo & Héribaud in Héribaud, 1893 (new combination reference)
Epithemia zebra f. medioconstricta (Cleve-Euler) Cleve-Euler, 1952 accepted as Epithemia argus var. medioconstricta Cleve-Euler, 1932 (new combination reference)
Epithemia zebra f. typica Cleve-Euler, 1952 (original description)
Epithemia zebra var. curvirostris Cleve-Euler, 1952 (original description)
Epithemia zebra var. frickei Cleve-Euler, 1952 (original description)
Epithemia zebra var. longirostris Cleve-Euler, 1952 (original description)
Frustulia amphipleuroides var. typica Cleve-Euler, 1952 (original description)
Frustulia rhomboides var. genuina Cleve-Euler, 1952 (original description)
Frustulia rhomboides var. tenuirostris Cleve-Euler, 1952 (original description)
Frustulia saxonica f. linearis Cleve-Euler, 1952 (original description)
Frustulia saxonica f. minor Cleve-Euler, 1952 (original description)
Frustulia saxonica var. compacta (Cleve-Euler) Cleve-Euler, 1952 accepted as Frustulia rhomboides var. compacta Cleve-Euler, 1934 (new combination reference)
Frustulia saxonica var. laticeps Cleve-Euler, 1952 (original description)
Frustulia saxonica var. leptocephala (Østrup) Cleve-Euler, 1952 accepted as Frustulia rhomboides var. leptocephala Østrup, 1897 (new combination reference)
Frustulia saxonica var. typica Cleve-Euler, 1952 (original description)
Frustulia saxonica var. undulata (Hustedt; Hustedt in Schmidt et al.) Cleve-Euler, 1952 (new combination reference)
Frustulia vulgaris f. parva Cleve-Euler A., 1952 (original description)
Frustulia vulgaris f. typica Cleve-Euler, 1952 (original description)
Frustulia vulgaris var. oblonga Cleve-Euler, 1952 (original description)
Gomphonitzschia ungeri f. rostrata Cleve-Euler, 1952 (original description)
Gyrosigma acuminatum var. lacustre (W. Smith) Cleve-Euler, 1952 accepted as Pleurosigma lacustre W.Smith, 1852 (new combination reference)
Gyrosigma attenuatum var. hippocampus (W. Smith) Cleve-Euler, 1952 (new combination reference)
Gyrosigma attenuatum var. typicum Cleve-Euler, 1952 (original description)
Gyrosigma distortum var. marinum Cleve-Euler, 1952 (original description)
Gyrosigma fasciola var. genuinum Cleve-Euler, 1952 (original description)
Gyrosigma prolongatum var. typicum Cleve-Euler, 1952 (original description)
Gyrosigma scalproides var. typicum Cleve-Euler, 1952 (original description)
Gyrosigma spenceri f. major Cleve-Euler, 1952 (original description)
Gyrosigma spencerii var. smithii (Grunow) Cleve-Euler, 1952 accepted as Pleurosigma spencerii var. smithii Grunow in Cleve & Grunow, 1880 (new combination reference)
Gyrosigma tenuirostrum (Grunow) Cleve-Euler, 1952 (new combination reference)
Gyrosigma tenuissimum var. genuina Cleve-Euler, 1952 (original description)
Hantzschia amphioxys f. aequalis Cleve-Euler, 1952 (original description)
Hantzschia amphioxys f. constricta (Pantocsek) Cleve-Euler, 1952 accepted as Hantzschia amphioxys var. constricta Pantocsek, 1902 (new combination reference)
Hantzschia amphioxys f. minuta Cleve-Euler, 1952 (original description)
Hantzschia amphioxys f. tenuis Cleve-Euler, 1952 (original description)
Hantzschia amphioxys f. typica Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. austroborealis Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. densestriata (Fontell) Cleve-Euler, 1952 (new combination reference)
Hantzschia amphioxys var. dubravicensis (Grunow) Cleve-Euler, 1952 accepted as Hantzschia dubravicensis Grunow, 1882 (new combination reference)
Hantzschia amphioxys var. falcata Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. karelica Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. nodifera Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. prolongata Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. subsalsa Cleve-Euler, 1952 (original description)
Hantzschia amphioxys var. truncata (Østrup) Cleve-Euler, 1952 accepted as Hantzschia truncata Østrup, 1918 (1920) (new combination reference)
Hantzschia amphioxyss var. linearis (Otto Müller) Cleve-Euler, 1952 accepted as Hantzschia elongata var. linearis Otto Müller, 1909 (new combination reference)
Hantzschia linearis var. linearis (Otto Müller) Cleve-Euler, 1952 accepted as Hantzschia elongata var. linearis Otto Müller, 1909 (new combination reference)
Hantzschia marina var. genuina Cleve-Euler, 1952 (original description)
Hantzschia marina var. lata Cleve-Euler, 1952 (original description)
Hantzschia marina var. obtusa Cleve-Euler, 1952 (original description)
Hantzschia virgata var. genuina Cleve-Euler, 1952 (original description)
Navicula crucigera var. subhyalina Cleve-Euler, 1952 (original description)
Navicula crucigera var. typica Cleve-Euler, 1952 (original description)
Navicula cuspidata f. angusta Dippel, 1905 (new combination reference)
Navicula cuspidata f. danaica (Grunow Ms., Cleve) Cleve-Euler, 1952 accepted as Navicula cuspidata var. danaica Grunow ms., 1894 (new combination reference)
Navicula cuspidata f. genuina Cleve-Euler, 1952 (original description)
Navicula cuspidata f. heribaudi (Peragallo) Cleve-Euler, 1952 accepted as Navicula cuspidata var. heribaudi Peragallo, 1893 (new combination reference)
Navicula cuspidata f. primigena Dippel, 1905 (new combination reference)