Erysiphe ornata (Braun) Braun & Takamatsu, 2000

Fungi, Ascomycota, Leotiomycetes, Erysiphales, Erysiphaceae

on Betula

Erysiphe ornata on Betula pendula

Betula pendula, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel

Erysiphe ornata: appressorium

appressoriun

Erysiphe ornata: cleistothecium and appendages

cleistothecium with appendages

Erysiphe ornata: immature asci

immature asci

Erysiphe ornata and Phyllactinia betulae on Betula pendula

Betula pendula, Belgium, prov. Antwerp, Mol, Buitengoor-Meergoor © Carina Van Steenwinkel: at left infection by Erysiphe ornata, at right by Phyllactinia betulae

Erysiphe ornata and Phyllactinia betulae on Betula pendula

same leaves, underside

Erysiphe ornata and Phyllactinia betulae on Betula pendula

the Phyllactinia cleistothecia are much larger. Contrary to Erisphe, the mycelium of Phylactinia is partly internal, killing deeper cell layers, wich locally results in a pale colour of the leaf.

gall

mycelium evanescent, amphigenous. Appressoria lobed or multilobed, mostly single. Conidia solitary, oblong-elliptic, without fibrosin bodies. Cleistothecia with 3-6 asci, that contain 6-8 spores. Appendages 4-10, equatorial, 0.5-1 x the diameter; they are stiff, mostly rough, brown near the base, at the tip 4-6 x times in quick succession dichotomously branched; no, or just one, sept.

hostplants

Betulaceae, monophagous

Betula humilis, nana, pendula, pubescens.

synonyms

Microsphaera betulae Magnus, 1898; M. ornata Braun, 1982.

notes

In Europe the variety europaea (Braun) Braun & Takamatsu, 2000. The typical form has a higher number of appendages (6-22) that moreover are longer (1-1.5 x the diameter of the cleistothecium). This form has been found in the Ukraine.

references

Adamska (2005a), Brandenburger (1985a: 53), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Czerniawska, Madej, Adamska ao (2000a), Dietrich (2016b), Dynowska, Fiedorowicz & Kubiak (1999a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (1995a), Kruse (2014a), Talgø, Sundheim, Gjærum ao (2010a).

19/04/2017

pub 25.v.2017 · mod 17.vii.2017