Synonymy:
Acrosporium Nees, Syst. Pilze (Würzburg): 53 (1816) [1816-17]
Amphiblistrum Corda, Icon. fung. (Prague) 1: 11 (1837)
Graciloidium (R.T.A. Cook, A.J. Inman & C. Billings) R.T.A. Cook & U. Braun, Taxonomic Manual of the Erysiphales (Powdery Mildews): 349 (2012)
Octagoidium (R.T.A. Cook, A.J. Inman & C. Billings) R.T.A. Cook & U. Braun, Taxonomic Manual of the Erysiphales (Powdery Mildews): 172 (2012)
Oideum Ehrenb., Sylv. mycol. berol. (Berlin): 10 (1818)
Oidium Link, Mag. Gesell. naturf. Freunde, Berlin 3(1-2): 18 (1809)
Oidium subgen. Graciloidium R.T.A. Cook, A.J. Inman & C. Billings, Mycol. Res. 101(8): 998 (1997)
Oidium subgen. Octagoidium R.T.A. Cook, A.J. Inman & C. Billings, Mycol. Res. 101(8): 998 (1997)
Oospora Wallr., Fl. crypt. Germ. (Norimbergae) 2: 182 (1833)
Toruloidea Sumst., Mycologia 5(2): 53 (1913)

Position in classification:
Oidium, Erysiphaceae, Helotiales, Leotiomycetidae, Leotiomycetes, Ascomycota, Fungi

Note:
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