Epithemia gibberula var. vanheurckii (Otto Müller) Frenguelli, 1924 accepted as
Rhopalodia gibberula f. vanheurckii Otto Müller, 1899 (new combination reference)
Epithemia zebra f. minor Frenguelli, 1924 (original description)
Epithemia zebra var. elongata Grunow ex Frenguelli, 1924 (original description)
Eunotia praerupta var. tridentata (Ehrenberg) J.Frenguelli, 1924 accepted as
Eunotia tridentata Ehrenberg, 1854 (new combination reference)
Fragilaria pinnata var. lapponica (Grunow) J.Frenguelli, 1924 accepted as
Fragilaria lapponica f. lapponica Grunow in Van Heurck, 1881 (new combination reference)
Fragilaria pinnata var. minor Frenguelli, 1924 (original description)
Fragilaria pinnata var. perlonga Frenguelli, 1924 (original description)
Gomphonema candelariae Frenguelli, 1924 (original description)
Gomphonema candelariae var. candelariae Frenguelli, 1924 (original description)
Gomphonema candelariae var. elliptica Frenguelli, 1924 (original description)
Gomphonema candelariae var. minor Frenguelli, 1924 (original description)
Gomphonema constrictum var. clavata (Ehrenberg) Swirenko, 1922 accepted as
Gomphonema clavatum f. clavatum Ehrenberg, 1838 (new combination reference)
Gomphonema olivaceum f. vulgaris (Kützing) J.Frenguelli, 1924 accepted as
Sphenella vulgaris Kützing, 1844 (new combination reference)
Navicula affinis f. minor Frenguelli, 1924 (original description)
Navicula affinis var. ampliata (Ehrenberg) Frenguelli, 1924 accepted as
Navicula ampliata var. ampliata Ehrenberg, 1842 (new combination reference)
Navicula charcotii var. magellanica Frenguelli, 1924 accepted as
Luticola magellanica (Frenguelli) Levkov, Metzeltin & Pavlov, 2013 (original description)
Navicula cuspidata sensu Frenguelli, 1924 (original description)
Navicula cuspidata f. craticula Frenguelli, 1924 (original description)
Navicula cuspidata f. major Frenguelli, 1924 (original description)
Navicula cuspidata var. major Frenguelli, 1924 (original description)
Navicula divergens var. parallela (Brun) Frenguelli, 1924 † accepted as
Pinnularia parallela var. parallela Brun, 1895 (new combination reference)
Navicula expeditionis Frenguelli, 1924 (original description)
Navicula fasciata var. fontinalis (Grunow) Frenguelli, 1924 accepted as
Navicula fontinalis Grunow, 1885 accepted as
Caloneis fontinalis (Grunow) Cleve-Euler, 1932 (new combination reference)
Navicula fuegiana Frenguelli, 1924 (original description)
Navicula fuegiana var. rostrata Frenguelli, 1924 (original description)
Navicula iridis f. minor Frenguelli, 1924 (original description)
Navicula iridis var. dubia Frenguelli, 1924 (original description)
Navicula laetvittata var. spathulata Frenguelli, 1924 (original description)
Navicula lata var. latestriata (Gregory) Frenguelli, 1924 accepted as
Pinnularia latistriata var. latistriata Gregory, 1854 (new combination reference)
Navicula linearis (Otto Müller) Frenguelli, 1924 accepted as
Diploneis linearis Otto Müller, 1909 (new combination reference)
Navicula magellancia var. candelariae Frenguelli, 1924 (original description)
Navicula magellanica (Cleve) Frenguelli, 1924 accepted as
Neidium magellanicum var. magellanicum Cleve, 1900 (new combination reference)
Navicula magellanica var. candelariae Frenguelli, 1924 (original description)
Navicula magellanica var. magellanica (Cleve) Frenguelli, 1924 (new combination reference)
Navicula microstauron var. stauroneiformis Peragallo in Frenguelli, 1924 (original description)
Navicula minutissima (Cleve) Frenguelli, 1924 accepted as
Navicula scutelloides var. minutissima Cleve, 1881 (new combination reference)
Navicula multicopsis var. lanceolata Frenguelli, 1924 (original description)
Navicula multicopsis var. linearis Frenguelli, 1924 (original description)
Navicula mutica (Kützing) Frenguelli, 1924 accepted as
Navicula mutica f. mutica Kützing, 1844 (new combination reference)
Navicula muticopsis var. lanceolata Frenguelli, 1924 (original description)
Navicula muticopsis var. linearis Frenguelli, 1924 (original description)
Navicula peregrina var. perlonga Frenguelli, 1923 (original description)
Navicula placentula f. minor Frenguelli, 1924 (original description)
Navicula portomonttana var. fuegiana Frenguelli, 1924 (original description)
Navicula porto-monttana var. fuegiana Frenguelli, 1924 (original description)
Navicula silicula var. parva Frenguelli, 1924 (original description)
Navicula silicula var. patagonia (Otto Müller) Frenguelli, 1924 accepted as
Caloneis silicula f. patagonica Otto Müller, 1909 (new combination reference)
Navicula silicula var. semicruciata Frenguelli, 1924 (original description)
Navicula smithii var. argentina Frenguelli, 1924 accepted as
Diploneis argentina (Frenguelli) Frenguelli, 1945 (original description)
Navicula stauroptera f. gracilis Frenguelli, 1924 (original description)
Navicula stauroptera f. parva Frenguelli, 1924 (original description)
Stauroneis abnormis Frenguelli, 1924 (original description)
Stauroneis anceps var. abnormis Frenguelli, 1923 (original description)
Stauroneis boudetii (M. Peragallo) Frenguelli, 1924 accepted as
Navicula boudetii M. Peragallo, 1921 (new combination reference)
Surirella apiculata var. panduriformis Frenguelli, 1924 (original description)
Synedra pulchella var. grunowii Frenguelli, 1924 (original description)
Vanheurckia interposita var. incomperta (Lewis) Frenguelli, 1924 accepted as
Navicula incomperta f. incomperta Lewis, 1865 (new combination reference)
Tierra del Fuego for
Navicula silicula var. parva Frenguelli, 1924
Tierra del Fuego for
Navicula silicula var. semicruciata Frenguelli, 1924
Tierra del Fuego (Argentina) for
Fragilaria pinnata var. perlonga Frenguelli, 1924
Tierra del Fuego (Argentina) for
Gomphonema candelariae Frenguelli, 1924
Tierra del Fuego (Argentina) for
Gomphonema candelariae var. elliptica Frenguelli, 1924
Tierra del Fuego (Argentina) for
Gomphonema candelariae var. minor Frenguelli, 1924
Tierra del Fuego (Argentina) for
Gomphonema candelariae var. minor Frenguelli, 1924
Tierra del Fuego (Argentina) for
Gomphonema candelariae var. minor Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula charcotii var. magellanica Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula expeditionis Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula fuegiana Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula fuegiana Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula fuegiana Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula fuegiana Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula fuegiana var. rostrata Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula magellanica var. candelariae Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula muticopsis var. lanceolata Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula muticopsis var. linearis Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula peragalli var. gracilis Frenguelli, 1923
Tierra del Fuego (Argentina) for
Navicula smithii var. argentina Frenguelli, 1924
Tierra del Fuego (Argentina) for
Navicula smithii var. argentina Frenguelli, 1924
Tierra del Fuego (Argentina) for
Stauroneis anceps var. abnormis Frenguelli, 1923
Tierra del Fuego (Argentina) for
Surirella apiculata var. panduriformis Frenguelli, 1924
Tierra del Fuego (Argentina) for
Surirella tuberosa f. elongata Frenguelli, 1924
Tierra del Fuego (Argentina) for
Surirella tuberosa f. elongata Frenguelli, 1924
Tierra del Fuego (Argentina) for
Synedra pulchella var. grunowii Frenguelli, 1924