Erysiphe hypophylla (Nevodovsky) Braun & Cunnington, 2003
on Quercus
Quercus robur, Nieuwendam: cleistothecium
detail
detail
Quercus robur, Belgium, prov. Antwerp, Mol, Klein Verkallen © Carina Van Steenwinkel
same leaf, underside
cleistothecium
appendages
asci
notes
mycelium inconspicuous, thin, mainly hypophyllous. Conidia formed sparingly, 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 be 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).