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Sphaerotheca

noun
Sphaero·​the·​ca | \ -ˈthēkə\

Definition of Sphaerotheca

: a genus of powdery mildews (family Erysiphaceae) having perithecia with one ascus and unbranched appendages that resemble hyphae — see hop mildew

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History and Etymology for Sphaerotheca

New Latin, from sphaer- + theca

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