Erysiphe urticae (Wallroth) Blumer, 1933

on (Pilea), Urtica

Erysiphe urticae on Urtica dioica

Urtica dioica, Belgium, prov. Antwerp, Mol, de Maat © Carina Van Steenwinkel

Erysiphe urticae: cleistothecium


Erysiphe urticae: conidiophore


Erysiphe urticae: appressoria


Erysiphe urticaeL ascua

Urtica dioica, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel: ascus


mycelium amphigenous, forming dense, white, persistent patches. Appressoria lobate, single or paired. Conidia formed solitary, elliptic, without fibrosin bodies. Cleistothecia 80-135 µm, with 5-10 asci, containing 2-6 spores. Appendages in variable numbers, sub-equatorial, 0.5-1.5 x the diameter. They are mycelioid, unbranched, largely hyaline, 0-4 septate.

host plants

Urticaceae, oligophagous

Urtica cannabina, dioica, kioviensis, pilulifera, urens.

Outside of Europe also Pilea glaberrima


Blumer (1946a), Brandenburger (1985a: 78), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Czerniawska (2001a), Dynowska, Fiedorowicz & Kubiak (1999a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Ruszkiewicz-Michalska (2006a), Scholler, Reinhard & Schubert (1996a), Scholler & Schubert (1993a), Sucharzewska, Dynowska, Kubiak ao (2012b).

mod 6.ix.2019