Phyllactinia angulata
Phyllactinia angulata is a plant pathogen infecting chestnut, beech, oak and elm trees in North America with powdery mildew. Collections on elm were segregated into a new variety, Phyllactinia angulata [var. ulmi|Phyllactinia angulata var. ulmi].
Reports of this species infecting pistachio are probably instead referrable to Phyllactinia pistaciae, described in 2003.