Synonymy:
Alphitomorpha divaricata Wallr., Verh. Ges. nat. Freunde Berlin 1(1): 39 (1819)
Erysiphe penicillata f. divaricata (Wallr.) Fr., Systema Mycologicum 3(1): 243 (1829)
Calocladia divaricata (Wallr.) Lév., Annls Sci. Nat., Bot., sér. 3 15: 155 (1851)
Microsphaera divaricata (Wallr.) Sacc., Syll. Fung. (Abellini) 1: 11 (1882)
Microsphaera alni var. divaricata (Wallr.) M.E. Jones, Bull. Univ. Mont. 61(Biol. Ser. 15): 62 (1910)

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

Note:
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