Erysiphe pseudoregularis Braun, 2012

Fungi, Ascomycota, Leotiomycetes, Erysiphales, Erysiphaceae

on Salix

Erysiphe pseudoregularis: mildew on Salix caprea

Salix caprea, Biddinghuizen, Spijk- en Bremerbergbos © Hans Jonkman

Erysiphe pseudoregularis: mildew on Salix caprea

the cleistothecia are recognisable als tiny brown dots

Erysiphe pseudoregularis: mildew on Salix caprea

cleistothecia under the stereo microscope

Erysiphe pseudoregularis: mildew on Salix caprea

cleistothecium with appendages

Erysiphe pseudoregularis: mildew on Salix caprea

hooked tips of the appendages

Erysiphe pseudoregularis: cleistothecia on Salix caprea

Salix caprea, Biddinghuizen, Spijkbos leg. Hans Jonkman: the microphoto’s suggest that the appendges extend horizontally, but alctually 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).

30/10/2016

pub 5.iii.2017 · mod 17.vii.2017