Alphitomorpha penicillata Wallr., (1819) Erysiphe alni DC., (1815) Erysiphe extensa (Cooke & Peck) U. Braun & S.

G. Winter, (1884) Microsphaera alni var.

Salmon, (1900) Microsphaera extensa Cooke & Peck, (1872) Microsphaera penicillata var.

Cooke, (1952) Microsphaera penicillata is a plant pathogen that causes powdery mildew on sycamore.

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