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Forensic Key and Diagrams to the Genera of Powdery Mildew in Fungi

Appendages coiled or hooked at tip - Uncinula
Appendages simple and straight with bulb-like base - Phyllactinia
Appendages branching dichotomously (antler-like at tip)
    Cleistothecium contains a single ascus - Podosphaera
    Cleistothecium contains several asci - Microsphaera
Appendages simple or irregularly branched, often entangled
    Cleistothecium contains a single ascus - Sphaerotheca
    Cleistothecium contains several asci - Erysiphe

Key to Genera of Powdery Mildew
(Drawing courtesy of C.B. Kenaga, E.B. Williams, and R.J. Green)