Podosphaera pruinosa (Cooke & Peck) Braun & Takamatsu, 2000

on Rhus

gall

mycelium amphigenous, mainly hypophyllous; heavy infestations may bring malformations and red discolouration of stems and leaves. Appressoria inconspicuous to nipple-shaped. Conidia formed in chains, with fibrosin bodies. Cleistothecium with a single ascus, containing 6-8 spores. Appendages numerous, sub-equatorial, 1-6 x the diameter; they are curved snake-like, weakly septate, simple, almost hyaline.

hostplants

Anacardiaceae, monophagous

Rhus typhina.

notes

North American species, first recorded in Europe in 2007; in Europe cleistothecia have not been seen so far.

references

Beenken & Senn-Irlet (2016a), Braun & Cook (2012a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a).

mod 26.viii.2018