Achnanthes hungarica var. rivularia (Frenguelli) Frenguelli, 1933 (new combination reference)
Achnanthes hungarica var. rivularia Frenguelli, 1933 accepted as
Achnanthes hungarica var. rivularia (Frenguelli) Frenguelli, 1933 (new combination reference)
Amphipleura lindheimeri var. neotropica Frenguelli, 1933 (original description)
Anomoeoneis sculpta f. gigantea (M. Peragallo in Héribaud) Frenguelli, 1933 accepted as
Navicula sculpta f. gigantea M. Peragallo in Héribaud et al., 1920 (new combination reference)
Denticula yberiensis Frenguelli, 1933 (original description)
Diploneis elliptica var. tropica (Zimmermann) Frenguelli, 1933 accepted as
Navicula elliptica var. tropica Zimmermann, 1918 (new combination reference)
Diploneis zannii Frenguelli, 1933 (original description)
Encyonema cristatum Frenguelli, 1933 (original description)
Encyonema excisum (M. Peragallo & Héribaud in Héribaud) Frenguelli, 1933 accepted as
Encyonema ventricosum var. excisa M. Peragallo & Héribaud in Héribaud, 1893 (new combination reference)
Encyonema excisum f. minor Frenguelli, 1933 (original description)
Encyonema turgidum var. itatiensis Frenguelli, 1933 accepted as
Cymbella turgida W.Gregory, 1856 (original description)
Eunotia camelus var. arcuata Frenguelli, 1933 accepted as
Eunotia ectorii Sala & Kociolek, 2023 (original description)
Eunotia camelus var. juga Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia camelus var. juga f. major J.Frenguelli, 1933 accepted as
Eunotia camelus var. juga Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia camelus var. juga f. minor J.Frenguelli, 1933 accepted as
Eunotia camelus var. juga Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia camelus var. undulata Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia camelus var. undulata f. major J.Frenguelli accepted as
Eunotia camelus var. undulata Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia camelus var. undulata f. minor J.Frenguelli accepted as
Eunotia camelus var. undulata Frenguelli, 1933 accepted as
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia correntina Frenguelli, 1933 (original description)
Eunotia didyma var. jugulata Frenguelli, 1933 (original description)
Eunotia didyma var. papilio Frenguelli, 1933 (original description)
Eunotia didyma var. pileus (Ehrenberg) Frenguelli, 1933 accepted as
Eunotia pileus (Ehrenberg) Reichardt (new combination reference)
Eunotia formica f. curta Frenguelli, 1933 (original description)
Eunotia formica f. elongata (Grunow) Frenguelli, 1933 accepted as
Eunotia formica var. elongata Grunow, 1865 (new combination reference)
Eunotia gracilis f. maxima Frenguelli, 1933 accepted as
Eunotia glacialis Meister, 1912 (original description)
Eunotia indica Frenguelli, 1933 (original description)
Eunotia indica var. bigibba Frenguelli, 1933 accepted as
Eunotia pseudoindica var. bigibba (Frenguelli) Luchini & Verona, 1972 (original description)
Eunotia indica var. gracilis Frenguelli, 1933 accepted as
Eunotia zygodon var. gracilis Hustedt in Schmidt et al., 1913 (original description)
Eunotia juga Vouilloud & Kociolek, 2023 (original description)
Eunotia larva Frenguelli, 1933 (original description)
Eunotia luna f. major Frenguelli, 1933 (original description)
Eunotia luna f. paucistriata Frenguelli, 1933 (original description)
Eunotia luna var. aequalis f. major J.Frenguelli accepted as
Eunotia silviasalae Guerrero & Vouilloud (original description)
Eunotia luna var. aequalis f. paucistriata J.Frenguelli accepted as
Eunotia deficiens D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 (original description)
Eunotia luna var. major Frenguelli, 1933 (original description)
Eunotia lunaris f. arcuata Frenguelli, 1933 (original description)
Eunotia lunaris f. cuspidata (Schumann) Frenguelli, 1933 accepted as
Ceratoneis lunaris var. cuspidata Schumann, 1867 (new combination reference)
Eunotia lunaris f. rigida Frenguelli, 1933 (original description)
Eunotia lunaris f. subarcuata (C.W.Nägeli) J.Frenguelli, 1933 accepted as
Synedra subarcuata Naegeli ex Kützing, 1849 (new combination reference)
Eunotia lunaris var. major (Grunow) Frenguelli, 1933 (new combination reference)
Eunotia lunaris var. perlonga Frenguelli, 1933 (original description)
Eunotia lunaris var. perlonga f. arcuata J.Frenguelli accepted as
Eunotia lunaris var. perlonga Frenguelli, 1933 (original description)
Eunotia lunaris var. perlonga f. rigida J.Frenguelli accepted as
Eunotia lunaris var. perlonga Frenguelli, 1933 (original description)
Eunotia major f. paucistriata Frenguelli, 1933 accepted as
Eunotia monodon var. major (W.Smith) Hustedt (original description)
Eunotia major var. gigantea Frenguelli, 1933 accepted as
Eunotia monodon var. major (W.Smith) Hustedt (original description)
Eunotia pileata Frenguelli, 1933 (original description)
Eunotia producta Frenguelli, 1933 (original description)
Eunotia pseudoindica Frenguelli, 1941 (original description)
Eunotia pseudoindica var. gracilis (Hustedt) Frenguelli, 1941 accepted as
Eunotia zygodon var. gracilis Hustedt in Schmidt et al., 1913 (original description)
Eunotia pseudoindica var. pseudoindica Frenguelli, 1941 accepted as
Eunotia pseudoindica Frenguelli, 1941 (original description)
Eunotia silviasalae Guerrero & Vouilloud (original description)
Eunotia sudetica var. undulata Frenguelli, 1933 (original description)
Eunotia yberai Frenguelli, 1933 (original description)
Eunotia yberai var. major Frenguelli, 1933 (original description)
Eunotia zygodon var. major Frenguelli, 1933 (original description)
Eunotia zygodon var. maxima Frenguelli, 1933 (original description)
Fragilaria brevistriata var. obtusa Frenguelli, 1933 (original description)
Gomphonema correntinum Frenguelli, 1933 (original description)
Gomphonema turris f. acuminata Frenguelli, 1933 (original description)
Gomphonema turris f. coarctata Frenguelli, 1933 (original description)
Gomphonema turris var. brasiliensis (Fricke in Schmidt et al.) Frenguelli, 1933 accepted as
Gomphonema acuminatum var. brasiliensis Fricke in Schmidt et al., 1902 (new combination reference)
Gomphonema yberiense Frenguelli, 1933 (original description)
Hantzschia elongata var. longissima Frenguelli, 1933 (original description)
Hantzschia exilis Frenguelli accepted as
Nitzschia amphioxys var. exilis Frenguelli, 1926 (new combination reference)
Hantzschia limi (Frenguelli) Frenguelli, 1933 accepted as
Nitzschia limi var. limi Frenguelli, 1926 (new combination reference)
Melosira italica var. laevis (Ehrenberg) Frenguelli, 1933 accepted as
Gaillonella laevis Ehrenberg, 1854 (new combination reference)
Melosira italica var. semilaevis (Grunow in Van Heurck) Frenguelli, 1933 accepted as
Melosira semilaevis Grunow in Van Heurck, 1882 (new combination reference)
Navicula americana var. yberai Frenguelli, 1933 accepted as
Navicula americana Ehrenberg, 1843 accepted as
Sellaphora americana (Ehrenberg) D.G.Mann, 1989 accepted as
Navicula americana f. americana Ehrenberg, 1843 (original description)
Navicula craticularis Frenguelli, 1933 (original description)
Navicula cuspidata f. craticula Frenguelli, 1924 (original description)
Navicula fuegiana var. yberiensis Frenguelli, 1933 (original description)
Navicula helea Frenguelli, 1933 (original description)
Navicula multicopsis var. yberai Frenguelli, 1933 (original description)
Navicula muticopsis var. yberai Frenguelli, 1933 (original description)
Neidium affine var. ampliata (Ehrenberg) Frenguelli, 1933 accepted as
Navicula ampliata var. ampliata Ehrenberg, 1842 (new combination reference)
Neidium iridis var. amphigomphus (Ehrenberg) Tempère & Peragallo, 1912 accepted as
Navicula amphigomphus var. amphigomphus Ehrenberg, 1843 (new combination reference)
Neidium iridis var. dubia (Ehrenberg) Frenguelli, 1933 accepted as
Navicula dubia f. dubia Ehrenberg, 1843 (new combination reference)
Nitzschia elongata var. longissima Frenguelli, 1933 (original description)
Nitzschiella lecointei var. correntina Frenguelli, 1933 (original description)
Nitzschiella lecointei var. lecointei (Van Heurck) Frenguelli, 1933 accepted as
Nitzschia lecointei van Heurck, 1909 (new combination reference)
Pinnularia acrosphaeria f. minor Frenguelli, 1933 (original description)
Pinnularia acrosphaeria var. americana (Tempère & Peragallo) Frenguelli, 1933 accepted as
Navicula acrosphaeria var. americana Tempère & Peragallo, 1913 (new combination reference)
Pinnularia carambolae Frenguelli, 1933 (original description)
Pinnularia clericii var. clericii (Frenguelli) Frenguelli, 1933 accepted as
Navicula clericii Frenguelli, 1923 accepted as
Pinnularia Clericii (Frenguelli) Mills, 1934 (new combination reference)
Pinnularia clericii var. correntina Frenguelli, 1933 (original description)
Pinnularia correntina Frenguelli, 1933 (original description)
Pinnularia dactylus var. gigas (Ehrenberg) Frenguelli, 1933 (new combination reference)
Pinnularia divergens var. laticeps (Frenguelli) Frenguelli, 1933 (new combination reference)
Pinnularia divergens var. parallela (Brun) Frenguelli, 1933 † accepted as
Pinnularia parallela var. parallela Brun, 1895 (new combination reference)
Pinnularia gibba var. parva (Grunow) Frenguelli, 1933 accepted as
Navicula stauroptera var. parva Grunow, 1860 (new combination reference)
Pinnularia gibba var. subundulata (Ant.Mayer) J.Frenguelli, 1933 (new combination reference)
Pinnularia hartleyana var. curta Frenguelli, 1933 (original description)
Pinnularia hemiptera var. obtusa Frenguelli, 1933 (original description)
Pinnularia latevittata var. spathulata (Frenguelli) Frenguelli, 1933 accepted as
Navicula latevittata var. spathulata Frenguelli, 1924 accepted as
Pinnularia spathulata (Frenguelli) Cleve-Euler, 1948 (new combination reference)
Pinnularia microstauron f. semicruciata Frenguelli, 1933 (original description)
Pinnularia microstauron var. subproducta (Grunow) Mills accepted as
Navicula brebissonii var. subproducta Grunow in Van Heurck, 1880 (new combination reference)
Pinnularia stauroptera f. semicruciata (Cleve) J.Frenguelli, 1933 accepted as
Pinnularia stauroptera var. semicruciata Cleve, 1895 (new combination reference)
Pinnularia stauroptera var. brevicostata Frenguelli, 1933 (original description)
Pinnularia subcapitata var. hybrida (Grunow) J.Frenguelli, 1933 accepted as
Navicula bicapitata var. hybrida Grunow, 1880 (new combination reference)
Pinnularia torrendi var. capitata (Zimmermann) Frenguelli, 1933 accepted as
Navicula torrendi f. capitata Zimmermann, 1919 (new combination reference)