Erysiphe pseudoregularis Braun, 2012
on Salix
Salix caprea, Biddinghuizen, Spijk- en Bremerbergbos © Hans Jonkman
the cleistothecia are recognisable als tiny brown dots
cleistothecia under the stereo microscope
cleistothecium with appendages
hooked tips of the appendages
Salix caprea, Biddinghuizen, Spijkbos leg. Hans Jonkman: the microphoto’s suggest that the appendages extend horizontally, but actually they are directed more or less vertically.
gall
mycelium amphigenous. Appressoria lobed, multilobed or coralloid, solitary or paired. Conidia solitary, elliptic, without fibrosin bodies. Foot-cell of conidiophore cylindrical, 20-70 µm. Cleistothecia with 4-15 asci, containing 3-6 spores. Appendages 30-110, equatorial, 1-2 x the diameter; they are hyaline, aseptate, unbranched, almost straight; the apex is uncinate-circinate.
hostplants
Salicaceae, narrowly monophagous
Salix caprea.
references
Braun & Cook (2012a), Klenke & Scholler (2015a), Kruse & Jage (2014a).