Peronospora radii de Bary, 1864

on Asteraceae, Anthemideae

Peronospora radii on Tripleurospermum maritimum

Tripleurospermum maritimum, Belgium, prov. Limburg, Herk-de-Stad, Schulensbroek © Carina Van Steenwinkel: the ligules stand unusually erect

Peronospora radii on Tripleurospermum maritimum

the disc florets bear no down but are disfigured nonetheless

Peronospora radii on Tripleurospermum maritimum

ligules with dark grey down

Peronospora radii

the tem is remarkably short and thick

Peronospora radii on Tripleurospermum maritimum

terminal branches

Peronospora radii

the conidiophores arise from a basal disk-shaped organ

Peronospora radii

young conidia

Peronospora radii

mature conidia

Peronospora radii: conidiophores

Tripleurospermum maritimum, Belgium, prov. Limburg, Bree, de Luysen © Carina Van Steenwinkel<

Peronospora radii: conidiophore

the conidiophores are standing on a remarkable “attachment disc”

Peronospora radii: germinating conidium

germinating conidium

gall

downy mildew on the leaves, but mainly on the disfigured flower heads, in particular the ligulate flowers. A down of erect, apically repeatedly dichotomously branching conidiophores produces a greyish-violet mass of conidia.

hostplants

Asteraceae, narrowly oligophagous

Achillea ptarmica; Anthemis arvensis, cotula, ruthenica; Argyranthemum frutescens; Coleostephus myconis; Cota austrica; Glebionis coronaria, segetum; Leucanthemum vulgare; Matricaria chamomilla, discoidea; Tripleurospermum inodorum, maritimum

synonyms

Peronospora danica Gäumann, 1923.

references

Belbahri, Calmin, Pawlowski & Lefort (2005a), Ben-Ze’ev, Kenneth & Bonde (1987a), Brandenburger (1985a), Buhr (1964b), Constantinescu (1989), Doppelbaur, Huber & Poelt (1965a), Ellis & Ellis (1997a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Gustavsson (1991a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Müller & Kokeš (2008a), Roskam (2009a), Rossman (2004a), Săvulescu (1948a), Tomasi (2014a), Voglmayr (2003a).

26/02/2017

pub 22.v.2017 · mod 19.vii.2017