Amphora dusenii f. simplex Krasske, 1938 (original description)
Amphora obscura Krasske, 1938 (original description)
Caloneis bacillum var. jonssoni (Østrup) Krasske, 1938 accepted as Caloneis jonssoni Østrup, 1918 (1920) (new combination reference)
Caloneis silicula f. arctica Krasske, 1938 (original description)
Cocconeis brevicostata var. obscura Krasske, 1938 (original description)
Cymbella obscura Krasske, 1938 (original description)
Eunotia praerupta var. excelsa Krasske, 1938 (original description)
Fragilaria brevistriata var. constricta Krasske, 1938 (original description)
Gomphonema angustatum var. lagerheimii (Cleve) Krasske, 1938 accepted as Gomphonema lagerheimii f. lagerheimii A. Cleve, 1895 (new combination reference)
Gomphonema angustatum var. obtusata (Kützing) Cleve, 1894 accepted as Sphenella obtusata Kützing, 1844 (new combination reference)
Navicula adversa Krasske, 1938 (original description)
Navicula aliena Krasske, 1938 accepted as Chamaepinnularia aliena (Krasske) B.Van de Vijver & R. Le Cohu in Van de Vijver et al., 2002 (original description)
Navicula digitoradiata var. minor Krasske, 1938 (original description)
Navicula gandrupi var. gandrupi (Boye Petersen) Krasske, 1938 accepted as Pinnularia gandrupii Petersen, 1924 (new combination reference)
Navicula gandrupi var. simplex Krasske, 1938 (original description)
Navicula gebhardi Krasske, 1938 (original description)
Navicula ignobilis Krasske, 1938 (original description)
Navicula ingrata f. capitata Krasske, 1938 (original description)
Navicula ingrata f. ingrata Krasske, 1938 (original description)
Navicula jungii f. jungii Krasske, 1938 (original description)
Navicula jungii var. inflata Krasske, 1938 (original description)
Navicula levanderi var. capitata Krasske, 1938 (original description)
Navicula menisculus f. minor Krasske, 1938 (original description)
Navicula molesta Krasske, 1938 accepted as Craticula zizix (VanLandingham) Guiry, 2018 (original description)
Navicula protracta f. minor Krasske, 1938 (original description)
Navicula pseudotenelloides Krasske, 1938 (original description)
Pinnularia streptoraphe f. minor Krasske, 1938 (original description)