Hydrangea, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel: appressoria

conidiophore

gall

mycelium amphigenous, also on the stems and in the inflorescence. Appressoria numerous, from nipple-shaped tot multilobed, often paired, not rarely in sequences. Conidia solitary, elliptic, without fibrosin bodies. Conidiophores amphigenous. Foot-cell of the conidiophore straight or somewhat curved. Cleistothecia unknown.

hostplants

Hydrangeaceae, monophagous

Hydrangea arborescens, macrophylla, xanthoneura.

synonyms

Oidium hortensiae Jørstad, 1925.

references

Ale-Agha, Boyle, Braun ao (2008a), Beenken & Senn-Irlet (2016a), Braun (1995a), Braun & Cook (2012a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Mułenko, Piątek, Wołczańska ao (2010a), Negrean & Anastasiu (2006a), Schmidt & Scholler (2011a), Talgø, Sundheim, Gjærum ao (2010a).