Erysiphe hypophylla (Nevodovsky) Braun & Cunnington, 2003

on Quercus

Erysiphe hypophylla: cleistothecium on Quercus robur

Quercus robur, Nieuwendam: cleistothecium

Erysiphe hypophylla: cleistothecium on Quercus robur

detail

Erysiphe hypophylla: cleistothecium on Quercus robur

detail

Erysiphe hypophylla on Quercus rorur

Quercus robur, Belgium, prov. Antwerp, Mol, Klein Verkallen © Carina Van Steenwinkel

Erysiphe hypophylla on Quercus rorur

same leaf, underside

Erysiphe hypophylla: cleistothecium

cleistothecium

Erysiphe hypophylla: appendages

appendages

Erysiphe hypophylla:  asci

asci

notes

mycelium inconspicuous, thin, mainly hypophyllous. Conidia sparinlgy formed, sometimes missing, solitary, cylindric, with rounded tips, without fibrosin bodies. Cleistothecia mainly hypophyllous, with 4-16 asci that contain 6-8 spores. Generally 10-10 appendages, attached to the equator. They are up to 2 x as long as the diameter, stiff, hyaline, septate, more or less straight; at the tip they are suddenly broadened because they are bifurcating there several times in quick succession.

hostplants

Fagaceae, monophagous

Quercus frainetto, petraea, pubescens, robur & subsp. pedunculiflora.

synonyms

Microsphaera hypophylla Nevodovsky, 1952.

notes

The cleistothecia cannot de distinguished from those of E. alphitoides that also lives on oaks. Contrary to that species, the leaves are not disfigured. Like alphitoides a neophyte, that arrived in Europe around the middle of the 20th century.

references

Braun (1995a), Braun & Cook (2102a), Braun, Cunnington, Brielmaier-Liebetanz, Ale-Agha & Heluta (2003a), Bresinsky (2016a), Dynowska, Fiedorowicz & Kubiak (1999a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a), Ruszkiewicz-Michalska (2006a), Sucharzewska (2009a), Sucharzewska, Dynowska, Kubiak ao (2012b), Talgø, Sundheim, Gjærum ao (2010a).

19/04/2017

pub 25.v.2017 · mod 14.vii.2017