Microsphaera

noun
Mi·​cro·​sphae·​ra | \-ˈsfirə\

Definition of Microsphaera 

: a genus of powdery mildews (family Erysiphaceae) having several asci in each perithecium and the appendages once or more dichotomously branched — see lilac mildew

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History and Etymology for Microsphaera

New Latin, from micr- + -sphaera

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